Well either I am crazy or it's not 8mm - that's a knock on me, not anyone else as I am frustrated at the moment (I cracked my dash panel that has the vent controls by being completely stupid....grrrrr). Now, I have a 5-speed. I'd assume it was from a 280Z, but IIRC you can fit a BW T5 transmission pretty easily. Would that mean that the threads on the shift lever are English rather than metric? The 8MM hex nut (both in 1.0 and 1.25 thread pitch) did NOT fit. To make things worse, I do own a Datsun/Nissan 4-speed tranny from a 1972 240Z that I planned to put into my car. The 8MM hex nut didn't fit on that either. So - it's either 9MM (do they even make 9MM nuts? I couldn't find them at HD) or it's English. I am inclined to think it's 9MM, but again, I couldn't find that size at HD. I am in an angered mood, so I am not thinking properly - my apologies in advance if I am posting something obvious, but my judgment is clouded at the moment