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Have you tried Summit? I bought a cap and rotor for a vintage Mallory distributor from them about a year ago. To find the proper fitment, you may have to use the later part number. (Mallory went from the YA-,ZC-, etc. part numbers to things like 25nnn at some time in the process.)
The only thing was it was a horrible blue plastic. I painted it black with some paint made specifically for plastic. So far, so good.