Was the crib model number 47504 recalled? If not how would I be able to get a new coaster wheel 4 x j ?

Your crib was recalled and company is out of business. DO NOT USE FOR YOUR NEW BABY.
This recall will be carried out by retailers since the manufacturer is no longer in business. These cribs were sold at Walmart, Target and Babies R Us stores. You should contact the store where you purchased the crib to receive a refund, store credit or replacement crib.Do not attempt to fix a recalled Simplicity crib. Please find a safe, alternative sleeping location for your baby until the crib can be replaced. It's important to note, as well, that all Simplicity drop-side cribs are already under recall due to a problem with the drop-side.https://www.cpsc.gov/en/recalls/2010/simplicity-cribs-recalled-by-retailers-mattress-support-collapse-can-cause-suffocation-and-strangulation/

First I would be super careful with this crib as it was part of a recall in 2011. The model number is 04550-97C. Please read here www.babycafe.com/stork-craft-recalls-2-1-million-drop-side-cribs/ get the 'recall kit' for it to lock in the drop side.
Good luck and hope this helps!

Looks like your crib may be on recall. Check this link and check your model number
and date of manufacture. The company will send you almost a complete new bed, less
the mattress support, for FREE. If yours is not on the recall list simply call Dorel and ask
if they can email instructions to you or possibly mail them to you.
Dorel Asia Crib Recall Info

Dorel Juvenile Group
Consumer Relations Department
P.O. Box 2609
Columbus, IN 47202-2609
Phone : (800) 544-1108
(7 a.m. to 6 p.m. EST Monday through Thursday,
and 7 a.m. to 4:30 p.m. EST on Fridays)

Contact Delta. If you are nice, sometimes they will send them for free.
Check for recalls on your crib because many are recalled. If so, maybe
they will send you a set of wheels free! Have your model number ready when you call.
The model number is on the mattress support board. Good luck!
Hours of Operation Monday through Friday
8 a.m. to 8 p.m. (Eastern Standard Time)
1-800-377-3777 extension 6221 or 212-645-9033
Fax: 212-645-9032

YES! All graco cribs in the 4 and 1 are recalled. Take it to Walmart for a full refund, no receipt required.
http://www.cpsc.gov/cpscpub/prerel/prhtml07/07307.html

http://www.csmonitor.com/Business/new-economy/2010/0429/Simplicity-and-Graco-crib-recalls-Is-your-crib-on-the-list

Luckily I didn't see your model listed in Delta's Crib Recall. Below is link to Delta's website and a list of all Delta cribs recalled.
http://www.deltacribrecall.com/

If this information is helpful, I would really appreciate a "thumbs up" rating!!

Delta cribs manufactured in Taiwan or Indonesia, with the “Crib Trigger Lock with Safety Peg” drop side hardware design, numbers:
4320, 4340, 4500, 4520, 4530, 4532, 4540, 4542, 4550, 4551, 4580, 4600, 4620, 4624 (production dates 01/06 thru 11/07), 4640, 4660, 4720, 4735, 4742, 4750 (production dates 01/95 thru 12/00), 4760 4770, 4780, 4790, 4820, 4840, 4850, 4860, 4880, 4890, 4892, 4900, 4910, 4920, 4925-2, 4925-6, 4930, 4940, 4943, 4944, 4947, 4948, 4949, 4950, 4958, 4963, 4968, 4969, 4980.

Delta drop side cribs manufactured in China through 2005, with the “Crib Trigger Lock with Spring Peg” drop side hardware design, numbers:
4340, 4343, 4520, 4600, 4620, 4624, 4625, 4629, 4660, 4665, 4720, 4750, 4751, 4850, 4855, 4857, 4880, 4920, 4925-2, 4925-2B, 4925-6, 4980, and 8605.

This is Products America! We service crib hardware for most non-recalled cribs. According to our list, this model is under a recall. If you are ever unsure about a product and the recall on a product, please visit www.cpsc.gov. Delta's contact number is 800-377-3777. We hope that this will help!

Storkcraft had a recall on some of their cribs.IF it is a Storkcraft you have to call them and give them the model number.
These cribs were made between May 2000 and November 2008.They were sold until Jan.2009.
Even if your's isn't a Storkcraft you should be able to call the manufacturer of your crib and ask them.
Storkcraft,for one,did not post the model numbers that were recalled.
The manufacturing date can be found on the lower right hand corner of the instruction sheet which is glued on the mattress base.
The cribs were sold in various styles and finishes. The manufacture date, model number, crib name, country of origin, and the firm's name, address, and contact information are located on the assembly instruction sheet attached to the mattress support board. The firm's insignia "storkcraft baby" is inscribed on the drop side teething rail of some cribs.For more information, consumers may contact Stork Craft toll-free at 866-361-3321 anytime to order the free replacement kit or log on to the firms Web site.
These cribs have had recalls as well:
Jenny Lind crib model 6982 with lot numbers 8021, 8024, 8025, 8052, 8053, 8055, 8056, and 8070 and model 6983 with lot numbers 8022, 8023, 8026, 8027, 8031, 8032.
Aspen 3 in 1, Aspen 4 in 1, Nursery-in-a-Box, Crib N Changer Combo, Chelsea and Pooh 4 in 1. The recall also involves the following Simplicity cribs that used the Graco logo: Aspen 3 in 1, Ultra 3 in 1, Ultra 4 in1, Ultra 5 in 1, Whitney and the Trio.

The recalled cribs have one of the following model numbers, which can be found on the envelope attached to the mattress support and on the label attached to the headboard: 4600, 4605, 4705, 5000, 8000, 8324, 8800, 8740, 8910, 8994, 8050, 8750, 8760, and 8996.
13 babies in the US alone died as a result of the Simplicity cribs...in Canada most of them were sold in Zellers...but don't try to take it back there.
LaJobi and CPSC announced two recalls for 4,900 cribs.

First, 2,000 Bonavita "Cabana" cribs were recalled for slat failure -- the slats can come loose and/or break. LaJobi had ten reports of slats coming out of the rails and six reports of slats breaking.

Also, 2,900 Babi Italia "Pinehurst" cribs and Bonavita "Hudson" cribs were recalled for drop side failures.
Step 1 Register your baby crib as soon as you bring it home so you will receive product recalls automatically. Usually manufacturers ask you to register to validate warranty information but this will also register you to receive product recalls.

Step 2 Check the U.S. Consumer Product Safety Commission website regularly for recall information. This is a dependable resource that many consumers are not aware of.

Step 3 Visit your crib manufacturer's website occasionally and type in your crib name or number under their search option.

Step 4 Monitor the recall website www.recalls.gov that constantly updates recall information on all consumer products including baby cribs.

Step 5 Stay up to date with current news reports and printed media outlets. They are often the first to announce safety recalls and possible product issues.

There have been many recalls in the last few months. Many babies have suffered injuries,and some have died. Please contact the maker with the model number to see if your's is one of them. They do not post most model numbers on line. Sorry.

Their website has a link to the list of models included in the recall. You can check if your model is one of them. At the bottom of the page is their toll-free customer support phone number, so you can try calling them if you still need information.