Thanks Alex! I looked high and low for shift knobs with the 1/2-20 thread, and came up empty, so I had those made up. I'm all sold out of the 6spd shift knobs. Have lots of the 5spd knobs left and a few of them blank with no shift pattern engraved. Not sure whether I'll ever order another batch of them to be made or not, so what I have on hand might be all that ever exists........