The Master Parts Catalog 1929-1954 shows no rear view mirror parts numbers for inside of trucks, only passenger cars with the exception of Sedan Delivery,(convertibles and Bel Air up until 1950 then they offered a chrome inside mirror)
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Section 16.068 in the Commercial Body Section of the 1929-1954 Chevrolet Master Parts Catalog.
The interior rear-view mirror was not standard equipment but it was available as a GM accessory from at least 1947 onwards (and in two styles, in at least some of the Advance-Design years).
