Looking for replacement knobs for my '85 JB Special. It has the origional "F" knobs, but I lost 2 of the caps and rubber grips. I saw what these were going for in Reverb and although I love my bass, I don't love it THAT much.... Although I would have taken better care of the knobs if I knew it would double it's value. That being said, I am looking for suitible replacemnts for knurled split shaft pots. I think i've been through every knob on Amazon and they either don't fit, or are of some kind of shoddy contruction. Black prefered. I might take the one goof F knob I have left and refinance my house with it.