1969 Barracuda Luggage Rack
Andy, I have not ordered from PG directly, but I had heard that it was hit or miss with them, and sometimes much more miss than hit.
If your dimensions work, perhaps check with Bill Rolik
http://www.billrolikenterprises.com/
or give Rick at Layson's a call and see if they have it. It know it is a little strange that we are fitting a puzzle piece to a pre-existing puzzle...
Looking at those Corvette racks, it seems that those would answer the mail. I could not see much difference in the "Mopar luggage rack" and Corvette ones, right down to the pedestals that hold it up. They look suspiciously alike to me.