I just spoke to a rep at Steeda, as I was looking at the aluminum ones they make. The rep said that bushings from a 79-84 mustang should work on my pinto (1980). I also tried Global West, as they make aluminum bushings too, but no luck.
I work in a machine shop, so I am pretty sure I'd be able to make a set for myself. Shouldn't be too hard to turn them up on a lath, then drill them out on a Bridgeport.
The biggest issue I have right now is trying to put in the 2-piece bushings. I can't pull the rack off the cross-member very far, as the oil pan is right in front of it, and I can't really drop it down as it is connected to the steering. May be able to undo the rag joint, drop it down, install them and put them back up.