1975 Silverado power steering pump

[usulnet]

I'm not sure if anyone else has had this problem or not but I have a 1975 Silverado with a 454. On the block is an air compressor, as far as I know it is stock, the options placard shows A/C. Anyhow the bracket for it is fairly oversized. As a result normal power steering pumps cannot fit it without rubbing on that bracket. I've tried two aftermarket pumps, Napa and O'reilly and while both slightly different in appearance they both had fairly large chimneys. My truck has a pretty narrow chimney and I'd just like to find an aftermarket replacement to replace my leaking unit (ruptured exterior so I can't just rebuild). Does anyone still make a replacement that works with that air compressor bracket that we know of? Thanks!

Stephan