BT UL cylinder ID question

Hey folks, there's a pair of cylinders I'm looking at buying, rear has a casting # 120-37 with a base spigot length about 2" in length (standard cylinder) but he other has a casting # 120-371 and the base spigot is about 1" in length. Can't ID it in my parts book. Any help appreciated. Can I run this pair as a set?

The 120-371,(a rear 13 fin) With the base spigot about 1" in length, Was likely cut to mimic the earlier VL cylinder. (1936)
I would closely measure both to see if they could be used as a pair..
These cast #'s originally were a pair.
120-37 front 13 fin. Are they 3-5/16" or 3-7/16"?
don

They both need sleeved.

Los Angeles sleeve, Centrifugal cast iron for harley-davidson,
3.422 bore, X 1/16" wall, 8" long is/was Catalog No. T-701H.
don