The link below is to a thread that includes photos of a Chev air compressor, the main difference is the side of the transmission they mount on so they look more or less like mirror images Ford to Chev but the shaft extensin and spring fittings look very much the same on both compressors. The spring is an over-center design to hold the control shaft in either position yet resist changing from one to the other accidentally. Searching on the word compressor should give you several more threads to look at.
http://www.mapleleafup.org/forums/sh...pressor&page=3