Time to address and post my survey findings for the 65 interior door handle transition from the style that used the C clips to the style with the screw style that continued into later years. We need to also understand that the change in the door handles and window crank created a need for a change in the shafts they attach to. The provision for the screw. This was also needed for the "pony" interior package and the different design of door handle installed on those cars
Earlier C Clip Style
Later Screw Head Style
Findings
65 San Jose built Mustang - Highest sequential VIN that I located with the early/first style - 5R18850x
65 San Jose built Mustang - Lowest sequential VIN that I located with the late/second style - 5R19546x