One more bit of information. The small lower unit works best with the V-6, such as a SSM with either 14/15 or one with 1/1 gears. The wedge I built was a 1" alluminum and was machined from the 1" at the top to 1/4" at the bottom. Worked great. Should you have any questions let me know. I am no expert by far, but have a lot of experience with a 15 footer. I had a Twister I, a stock 150 S/S, a stock 150 in line with a S/S and 1/1 lower, a 2 leader V-6 and the 2.4 V-6 both with 1/1 lower units on a 15' Allison. Good luck and enjoy.