What is the correct caster wheels part number for Dell PowerEdge T320?

Hi there,

I'm expecting delivery of a 2nd hand Dell PowerEdge T320 server which comes with the standard fixed feet and which I want to put on caster wheels. However, an internet search didn't come up with the part number for the correct set of caster wheel feet for the 12G tower servers. The only part numbers I could find are T501M and J282R, and it appears the former are for the old 11G servers and the latter for the 13G/14G servers. I couldn't find anything specific for the 12G T320. 

Failing that, what are the chances that the J282R fit to the PowerEdge T320, seeing that the chassis must be roughly the same as the T330?

I really like Dell hardware but I can't understand why finding part numbers is so damn difficult with Dell. I really wish there was a Dell equivalent to HP/HPE's Partsurfer...