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Wouldn't count on the mirror being a GM piece as those were still extra cost option in 1960. It might be on a Ninety Eight but lot of mirrors back then were bought at auto parts stores.
Moulding part #s from 65 Chassis parts book:
RH top moulding 59-3/8" long, group 8.147 p/n 577478, LH 577479 1960 all