How do I order the bolts for model number 4860-4 Crib?

SOURCE: want to convert my son's delta crib into a toddler bed

If your crib didn't come with the side rails you may not be able to find them. also check for recalls the Delta cribs have been having a few.

SOURCE: I have a Delta luv crib from 2003 - model number

That model has been recalled for missing safety pegs on the legs. If any of the legs of your crib are missing the safety pegs, call Delta at (800) 816-5304 for a free repair kit. (I would probably call them anyway just to clarify if there are any further problems with your particular model)

SOURCE: I need 2 stabilizer bars for a Delta Luv Millenium

I HAVE A MILLENNIUM CRIB BED I NEED 2 STABILIZER BARS

SOURCE: Delta - Baby Products 5-in-1 Crib: is the delta crib with the model number 4-520 reca...

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!

SOURCE: I have a Delta Luv Crib Model 4885, Order No.

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.