Hi Bob,
Unfortunately these 13" wheels are very hard to come by, no matter where you are located on the globe. Of course, I am screwed down here in Texas.
If anyone has an affordable extra 13" wheel, please let me know.
edit: Bob, the plan is to use the center out of one of my 15" aftermarket wheels I bought a while ago,(post #65). The center will be cut out, turned down to correct size on my friend's lathe and welded into one of the wide late '60's Chevrolet Corvair 13'' outer rims.
Thanks, David