You can straighten them and put them "pretty much" back into shape.
The one that I gave Roger (he needed one, and I got the one from the "parts stash") came from my white project car. It was smashed flat enough that I was afraid to drive it.
Once I removed it from the car (very easy on an 88) I clamped the "short end" into my bench vise, just beyond the crushed area, and bent the pipe as straight as possible, using the leverage of the long section. I then removed it from the vise and hammered the wide (formerly bent) area back into shape. First on one side, and then the other. (I may have also used the vice to squeeze it back into shape. I don't really remember. Just whatever method you choose, don't "go gorilla" on it. It can be broken.)
You will never get it completely straight, or completely round, but you can probably get it 75-80%. I thought about driving a socket into it, in order to spread it and round it a bit more, but figured I'd never get it back out.
Roger can comment on the quality (or lack of it) of the fix, since he has the pipe, now.