220?

Will 38 inch cast centers from a 7000 series work on a 220 with 30.5x24

Ok perfect :)

When I purchased my 220 the rear castings were both cracked?   It had 38" centers.  I searched forever to find vintage exact replacements.  I did in fact find several sets but always one of the pair would have hairline cracks in the same spot as my 220 had.  All were casting # 265221-03.  In the end I went with a set of 38" castings off of an 8030 They had already been removed from the tractor and were stored in a rack at the local salvage yard.   They had "removed from an 8030" painted on them using a paint pen. .   These were casting # 271989-02.   As mentioned earlier your wedges make up the variation for your 3 5/8" axles.  I purchased the Agco pilot bolts and a 7/8" X 12 TPI tap to chase the holes in my wedges.  That is an odd tap but they are still available.  An old mechanic later told me that they just re-tapped the wedge holes 1"-8 UNC and used grade 8 bolts as the jack bolts to drive the wedges off.  I have since talked with a person who switched his out centers with centers off of a 7060.  These were a 70254094 casting.  I think you have many donors that you can use the castings off of.   We had both wheels switched out on my 220 in less than 1 1/2 hours.  Good luck.