I think some clarification by documentation is in order here. The 1965 Sales Brochure dated 4/65 notes that "Rocker Panel Moldings are Standard on Fastbacks" (although it doesn't say so, this would not include a GT Fastback). Yet in the Salesman's Price Book dated September 25, 1964, it notes that the "Accent Group" (not Exterior Décor Group) is $27.70 for Hardtops and Fastbacks, and $14.20 for Convertibles. In addition, it only shows the Rocker Panel Molding Option for Hardtops and Fastbacks. Thus, the Price Book implies that Rocker Panel Moldings came Standard with Convertibles ? Does anyone have any documentation to clarify this ?
Although the OP's question was in regard to 1965's, since 1966 was mentioned in a Reply, I think it would be good to clarify the same for 1966. All 1966 Models included Rocker Panel Moldings (except GT's of course). For 1966 the "Accent Stripe Option was available, but only included the deletion of the side quarter ornament and the addition of the pinstripe. Note that the price for this Option reflects this accordingly.
Bob