Warning Will Rogers - Before you drill!!! Read through and look closely at those instructions. I would pay extra attention to the instructions in "Step 3" and the picture "Figure 2". In my minds eye, you need to disassemble the antenna cap, bezel and bezel gasket from the antenna rod and slide the antenna UP through the hole in the fender extension when installing. I highly suggest you disassemble the antenna and check the diameter of the antenna shaft (above the cast base portion) that goes through the hole and the existing drilled hole. You shouldn't need to drill that hole any longer IMHO.
This antenna install is completely different from most mid 1960's Chevy cars which used a completely different mounting set up and a much larger hole in the fender/body panel,which may be what is making you think you need larger hole.
Edit: Adding a note that when you install the antenna to the extension panel, that is done with the extension panel removed from the truck.
Last edited by Gdads51; 11/19/2024 5:58 PM. Reason: add edit note
