Have you tried Ausley's, O.P.G., Year One, National Parts Depot, and the others? I have seen the wood wheels contacts advertised, they may be for the '67 up 3 spoke ones , I don't know if they are any different.
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1972 Malibu (1 st. car) Project waiting to happen
Team Chevelle # 427
A.C.E.S. # 1282