I am putting together a rallye dash for my '73, and am a bit stumped. I ordered a set of the aftermarket reset knobs, but neither of them fit onto the reset arm (for lack of a better term) of the speedometer. The arm is rectangular instead of round, and has little teeth on the end instead of the threads for the lock screw. Both reset knobs are identical. Should one knob be different, or is something screwy with my speedometer. I will try to post pictures next if the server doesn't crash on me, again.