I need a john deere X360 44" front blade

There are two deck widths. See operators manual, no registration no fee downloads are available at the John Deere website.

https://techpubs.deere.com/en-US/Search/Equipment

Ented model number, select appropriate document by serial number range and region (North America / Export,etc.)

http://manuals.deere.com/cceomview/OMGX21821_C6/Output/Index.html?tM=HO

Check the cable and retaining lock pin "N"

http://manuals.deere.com/omview/OMGX25658_19/?tM=HO

Here's the link and I'm sure you will get the solution of your problem.
JOHN DEERE D140 SERVICE REPAIR MANUAL

HOW TO MAINTAIN JOHN DEERE LAWN MOWER DECK REPLACE BLADES PULLEYS BELTS

TRY THIS VIDEO MAYBE IT CAN GIVE YOU A BETTER IDEA .

This should help.

http://wishylife.info/data-post/j/john-deere-r72-manual-114187.pdf

Here's the link and I'm sure you will get the solution of your problem.
John Deere LT160 Service Repair Workshop Manual Pdf

check your blade brake for that blade,supposed to rub against top blade pulley when blades are disengaged,if its a manual engage vs electric clutch

If you want to solve your problem, click on the link I attach.
Best Manuals

yes. your mower has a blade engagement cable attached to the drive sheve. i am providing a link to the manual which shows this.

http://manuals.deere.com/cceomview/OMGX22464_C8/Output/Index.html?tM=HO