Wow, clean Arizona car someone converted to discs. Gordon https://phoenix.craigslist.org/evl/cto/d/mesa-1968-buick-riviera/7057816040.html
It looks remarkably solid; I'd have to see how much of the paint is actually left, but this has some potential.
The 4 wheel disc set up is too cool but the rear calipers are on backwards with the (not hooked up) handbrake cables levers facing to the rear. Clearance looks tight on the wheels.
Scarebird offers brackets for the front and rear for the Rivs. It's a bit of a mismatched parts list from various different year, make and model cars but it's doable. I had them email me the parts list for both front and rear conversion so when the time comes I know what I'll need.