The Parts CD omits much of the info about 52 flat-V8 motor mount parts but what I found was:

Bolt - 1/2"-20 x 3.40" long (note that '48 - '51 is a 7/16")
Upper insulator (rubber) - 8L-6038-B

It does say that for '52, 6-cyl and all V8's use the same parts. Seems like you're good!

 

I hope so. If they are too large, what kind of problems should i be looking for?