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Did anyone ever make a batch of these for sale or does someone have dimensions that they have published? This sounds like a good mod to do according to the posts in the archives
Unless you've got your front fender ripped off and can pull the evaporator box, you might want to go ahead and buy the fan and build your own spacer.
cut a hole for the squirrel cage, insert fan, draw around mounting flange, and cut it out. Drill the holes, mount to the evaporator box (of course, after removing existing fan, being careful not to harm the capacitor mounting tab).