Hy Beewrangler, according to my Euclid catalogue it should be there p/n E83210 = GM p/n 5557565, the upper mount is offset with a 3/4" hole, the width of the mount is 3.125", the lower mount is centered with a 3/4" hole, and is 1.75" wide, niether number would cross into Napa numbers, hope that helps