Try to contact Chuck Ewing @ 419-877-0943.
He at one time had racks custom built for 81-82 that were very nicely built, black powder coated, and a direct bolt on.
I spoke with him several months ago and he still had a couple of racks left. Priced @ $180.??
He is kinda "special" (as most of us older guys are), so here is a heads up. DON'T call before 10:00 AM or after 3:00 PM, Mon- Thur. (he is elderly) and works a very strictly limited schedule. CST
He is a very nice fellow, so give him a call according to the schedule