Sharon,

My 1954 3100 u-joint kits (different brands) all came with a few shims. You might want to check with the machine shop (but, if there were shims, they are probably long gone).

For example:
https://www.chevsofthe40s.com/detail/6372/Chevrolet_Kingpins_34ton_1ton_112ton_Except_DD.html

I do not know sizes/diameters, but here is a kit of shims: