Early 65 Mustang Disc Brake Rubber Pedal Pad for cars with manual transmission
The early 65 (sometimes even a bit later) rubber Disc Brake Pedal Pad had no groove for the SS trim.
We have seen these on Mustangs and GT350 Shelbys built as late as June 1965. Lots of 65 (and some carryover 66) GT350 Shelby Mustangs had this style pedal pad.