looking for a 77-79 Firebird Olds 403 Power Steering Pump Rear Mounting Bracket. OE#527763

 

Welcome and good luck. I'm sure you know that those brackets are unique to the F-body installations. There were Firebirds sold in California with an Olds 350 that would also have the same bracketry. That hopefully expands your search, though only by a minuscule amount.

 

Thank you!