GM Part # 3884850 Clutch and Brake Pedal Cover
4.630 COVER, Pedal
65-70 Pass (exc. A.T.)
68-70 Pass w/disc (exc. A.T. Caprice, Impala)
3884850 Replaced 3881782 11-65
3884850 Replaced 3941413 01-71
3884850 Replaced 3931416 06-71
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.
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!