I decided to try the new corbin seat, I know it is exspensive but If it works well then it will be worth it. I asked them to take an extra inch out of the drivers seat so I can sit further back. I am 6' with a 32" inseam and could use a little more leg room. I already took the back pad off and it did help some. Corbin also said if I didn't like the fit the first time they would do a free ajustment, after that it is 60.00 for any additional ajustments. The riders seat is 13.5" and the passengers is 20" these dimensions are different then the 650 seat which has more room for the rider. I hope the 400 seat has as much room as the 650. The reviewer of the 650 said he had plenty of room. Before I ordered the corbin i went to my local upustory shop But he didn't want to touch it. Wish me luck, I hate wasteing money. cary