I will give a heads up that if he has an NV3500 and wants to do it right with the the Hurst S10 shifter a piece of 1/2 inch aluminum plate is the way to go for a spacer. I had to trim 3/16 from the steel ball at the bottom of the stick that fits into the rail socket. I would also drill and re-tap the metric shifter holes to take 5/16-18 Allen cap screws and blue loctite. There is a whole pile of leverage that high tower pivot Hurst shifter places on the shifter housing.