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I can tell you that after the splines on my 500/4 gear lever became worn, I fitted one from a CB750 K2, which worked perfectly well in terms of bend angle and length. At the time, the item for a CB500/4 was unobtainable from any of the usual sources. I intended to find and fit an original, correct part when I could source it, however things looked fine and worked so well that I left it all alone.
Just measured my two 500s, 10cm as near as dammit.Also from surface of sprocket cover to metal of lever at the foot end 5-5.5cm
Ted, Just to add my measurement was the straight distance how far the lever is in front of the pivot point. The actual length of the gear lever is about 11.5cm.Lever about 3.8mm from alternator cover.