I used a GM one...think it might have been for an S10, but I would have to dig through my old numbers and notes...I was going to try and use the 2000 year model Camaro one my engine and trans came from, but this other one I stumbled across was the perfect angle for the firewall I reckoned.
For the linkage..this one had a really long push rod with an eyelet on the end. I just welded an extra arm onto the clutch pedal and just cut the pushrod to length and then ran a die over the pushrod and screwed a rod end onto it. Works perfectly !
I used the factory throwout assembly of course too...believe the Camaro one would be similar to the Commodore one...
Oh, and on the underdash pics...the push rod pushes nice and straight, just looks odd in some of the shots from trying to hold the camera under there, ha ha..