I have a set that was installed on an 18 with the new style lower castings. You have to drill and tap new screw holes for the attaching screws because they don't match up with the holes for the original gudgeons. Also, if you put the new bushings in the gudgeons and the castings, you need to grind a little of the casting away to make room. It is a tight fit anyway, but the bushings make it too tight between the castings and gudgeons. Once they are installed, though, it is AMAZING how nice they work! No slop!!
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