Turns out these are common on 79 to 80 or so. Just go looking for a 79 four car before all the circle track racers scoff them up......
Some plain 2.3 cars had them, turbos had them, and the 80 and probably 81 255 v8 cars had them. I have a couple of sets, front and rear, but they are in use, and or spoken for. I got mine from a 2.3 79 notch, and an 80 Capri 255 v8 car.