Originally Posted by Rulez

Just an update here, I sent the 90mm knob back to Z1 and they confirmed that it will not fit on the stock 370Z shifter. They have now put a disclaimer up on their site. They did say that it will fit their short shifter, though.

They offered me either a discount on their short shifter or a swap for the short, 70mm knob. I just ended up going with the short knob. Kudos to them for being cool about the situation and making it clear that their goal was to make the situation right.