Somebody does since the NPD catalog has the entire frame rail, shock tower, fender aprons assembly for $799 (old catalog).
If not, there are used ones out there, but they may need a little work. I have a 72 coupe I'm parting out that has decent original shock towers and the frame rails don't look bad (needs more examination). They might need some small patches here or there, but the front of them are not rotted out.