S/S Springs w/ B-Body 8-3/4" What Shocks to Use?

I bought a set of B Body shocks to try, but it appears as though their top mount is different than on the A Bodies. Instead of it fitting over the stud it's smaller like it uses a through-bolt instead. According to rockauto the part number crosses to the New Yorker as well.
Any ideas? Do you have to put a new bushing in the top of the shock that has a bigger eye in it?
Thanks,
Jon