Power Steering bracket/pulleys help please.

Why can't I swap a Federal pump into the same brackets the original TRW/Thompson bracket?

What a mess I have gotten into, I upgraded to an nice aluminum water pump and newer style front cover (timing mark on opposite side), bought a nice fluid damper and was going to buy a 70 style aluminum radiator to finish it off.

So my new plan is to buy a new cast iron water pump (flowkooler), buy an original style vibration damper (avoid the pulley's not lining up issue) which require newer style front cover for the timing marks and recore my original radiator with 3/4" tubes which flow about 1/3 more and keep my original fan shroud.

So I hope to swap in a federal pump and hope the pulleys line up, if not I will have to try another way.

Saginaw pumps sit low on drivers side and may be a problem with my lower radiator hose, not sure.

The brackets for the Federal pump are for a 70-72 with aluminum water pump.

Federal pumps are easy to get and TRW seem to be non existent.

Last option is rebuild my TRW pump and not sure where to get a kit for that, checked Rock auto and they list a kit for a Chrysler style pump so I can only assume it is TRW.

Anybody switch out just the pump?