The part number called out in the 67 Electrical Assembly Manual, 374121-S2, apparently does not exist (a case of "creative part number engineering"?). In 1968 (and 1969) the part used was 55927-S36, 8-18X1/2 PAN 5/16, XREC, TPG for both sides. My notes say we used 55927-S36 on the 67 project but I can't justify the decision (it's been about 8 years). In general, Ford used gold zinc plated parts in electrical applications, eg grounds.
Jim