I got my four hole Aerostar units from NAPA Auto parts, but that was a few years ago. One of the better mods I’ve done to the car to improve its operation. The info is here http://www.panteraplace.com/page164.htm
Bill Taylor came up with the Taurus motor solution. The part numbers for the Taurus parts are here http://www.panteraplace.com/Page187.htm
Both solutions work really well and the nice thing is it improves the operation but it is not visible unless you take the door apart. Those are the type of mods I like best.
Mike
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