If you had access to a lathe you can do your own. I did Itook a set of weld draglites and separated them at the weld and added a strip in the middle tig weld it up viola . Mine are 15x12 1/2 8 1/2 backspace.

E. Williams 65 Coronet 500 3400lbs w/d, 446, Indy EZ'S, A&A transbrake,Comp 650 lift cam, 6.50 @ 105 mph 1/8th 10.25 @ 130mph 1/4