General Motors Part Number 3723230 Pedal Stop Bumper
0.829 BUMPER, Clutch pedal shaft lever (5/8 Free height)
55-57 Pass. Corvette (Chevy)
58-66 ALL ST (Chevy)
62-63 Chevy II
60-66 ALL exc. tilt (Truck)
4.625 BUMPER, Brake Pedal (rubber-5/8 O.L.)
58-65 ALL Exc. P.B. (Chevy)
3723230 use 3889905 11-66
3723230 Replaced 3781770 05-66
Factory correct applications are your responsibility. GM made part and part # changes with no rhyme but a reason (no production interruptions at any cost).
Application charts are for replacement parts that were available at the time of parts book printing, and when possible model specific assembly manuals.
My observations come from the parts I have in my collection or other reliable sources your parts may differ.
If Factory correctness is your goal, do more research, join car clubs,
forums and buy an assembly manual if one is available for your Project Car (you wont be sorry).
This is a fun and interesting part of the hobby!