[Ollie]

Hi,1968 GTO Resto-mod.

Welcome to the Forums. Yes, I am subscribed to this thread, so any time a new entry is posted I get notified.
I see you have a 1968 engine with a 4 inch deep water pump. Keep in mind this modification was done on a later engine with a 4 1/2 inch ware pump.
You will have to figure out the correct spacer length for your engine.
I purchased the Idler arm, Power steering pump/ alternator Spacer, Water pump and Crank pulley from Jimmo.
The Alternator and Power Steering pump on E-bay.
The Sanden A/C compressor bracket form Vintage AIR.