Where to get a front pump for a 42RH (A500)

My guess is you most likely need a 42rh pump. Ma Mopar was famous for making changes every couple yrs. I have an A500 pump that I bought for a trans. I was rebuilding for a buddy and it didn't fit. If you can get me the casting # off yours I'll see if this one I have will work. It's in real good shape and you can have it for $40 shipped if it'll do you any good.