Power steering bracket help

There are two "older" power steering pumps, the Federal and the TRW. Upon initial inspection they appear very similiar, but they use totally different brackets. If you try to mount a TRW pump with federal brackets or vice versa, life will not be good!

Here's the pump differences:


ALSO many of the old brackets (TRW and Federal) were different on the cast iron water pump housings on the 66-69 motors. Using them on the post 70 aluminum water pumps presents a different set of problems