Checked it out. Very helpful, but the pictures of in the Kodak Gallery are gone. I have two samples. One came off of a '63 389 no air that had shallow spines going in one direction (the right handed picture in the HAMB thread), and another with the last three digit part number of 677 with an "andromeda" or spinning star burst pattern going the other direction (the left handed picture in the HAMB thread). The later came off of a '63 421 with air. The distance from the back of the housing to the face is different. The proper distance for all of the pulleys to line up is the starburst/421 pump.
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