clutch fork?
I am using a \6 fork in a sb bellhousing. It works but I am not convinced it is the same. When the free play in the pedal is adjusted correctly stroking the pedal to the floor puts the pressure plate fingers into the disk. Been running it with a block of wood under the carpet so I can't push the pedal to the floor.
I had called Brewers about this topic and they didn't know for sure. I measured the overall length the best I could with the fork installed and it appeared to be the same. The issue I have would be rectified if the distance from the pivot to where the clutch rod goes through was longer.
I have a new sb fork from Brewers that I will be installing when I pull the tranny in a week or two and I will be able to confirm if there are any differences. The overall length could be the same but if the pivot isn't in the same place you may have to little or in my case to much travel at the throw out bearing.
BTW, the bb block fork is definately different.