Harley tank shift levers

I got this neat picture of different shift arms off of the Mat Olsen blog (all kinds of cool stuff going on over there ). left to right 1936 knucklehead only. 1937 to 1946, 1947 to some time in the fifties, and a late one that I have no idea when hd started to use it. The knob is at a crazy angle and it is very homely.