Well it appears I may be out of luck. Tim told my dealer he could only do the 50mm spacing in purple. I e-mailed Tim to see if maybe he is just out of 53mm purple bobbins and may be able to do it in the near future, but I think I'm SOL and will probably just have to go black. Although I think I recall reading something that said he only could ever to purple in 50mm. I wonder if the couple of guys who used them in normally F-Spaced guitars just used the 50mm. I wonder how much it would effect the tone?