For sale is a NOS 541963 power antenna mast assembly. My 1969 Pontiac book shows it to be correct for 1962-69 full size Pontiacs and 1964-69 GTO/LeMans. This is the assembly line correct version with the longer mast. This part number later changed to 9795957 which was shorter.
The price book shows these part numbers fit Buick and Oldsmobile as well. I do not have those parts books so please verify your application on those models.
I fully extended this so you could see it works. The item "1967 1968 1969 GTO PONTIAC OLDSMOBILE 442 SKYLARK PONTIAC NOS POWER ANTENNA MAST" is in sale since Friday, September 25, 2020. This item is in the category "eBay Motors\Parts & Accessories\Vintage Car & Truck Parts\Accessories". The seller is "ravjudge" and is located in Le Mars, Iowa. This item can be shipped to United States.