The reproduction Zip rack on the back of the roadster came from a friend about 15 years ago. I found another at the Big 3 swap a couple of years ago and bought it for another couple who wanted one. Aside from the chrome plating of the rear bar, it doesn’t seem that making one would be that difficult.
It is correct that the reproductions are no longer in production and haven't been for many years. I did find an original at Hershey a couple of years ago and now it awaits restoration so the originals are still out there.
I picked one up because it's basically invisible when not in use. I was getting a Victoria and thought it was important not to mess up the look with a folding rack. The Victoria deal didn't work out but I have the rack and trunk.I have the folding type luggage rack ..... I would opt for a reproduction of the Zip-A-Rak for my Victoria.