Toolmaker's mirror extensions v3

The distance from the upper pin in the base at the rubber gasket to center of the ball joint where it meets the mirror:

Stock mount: 2 3/8 inches Version 1: 2 7/8 inches Version 3: 3 3/4 inches

So, a mirror in V1 is 1/2" further out than stock and V3 is 1 3/8" further out, but 1 3/8" may be a little much. V3 is further aft and a little down compared to stock and V1. There isn't any difference in performance between V1 and V3 so far. I attribute the better vision entirely to their vertical position, not their horizontal or fore/aft position.