I presume factory V8; if so then 64 and 65 V8's obviously as well as 65/66 slants with factory integrated AC (not the kneeknocker style) will be the interchange for the V8 pedal. For the slant pedal 63 (and possibly earlier) through 66 is the interchange.
EDIT: there is now a repro pedal but it's only the pedal, no hinge or plastic slider at the top.