Switching from a manual foot pump to electric

Well... I strongly suggest you guys hop on over the mymopar.com Over there they have the parts manuals that cover the years you are asking about. I downloaded the 69 manual (funny enough, I dont own a 69), but I am guessing the switch should be the same between the 67-69. but in the 69 manual this is what I found:

for the switch w/shield washer the part number is 2770 378. This is the same part number as the variable speed motor. If you would like to verify this, the switch is covered in section 23-67-160