Guys, I followed a DIY in the Illustrated's Section here:
http://forums.viperclub.org/threads/612361-lowered-my-seat-1-quot-DIY I experimented on how much I could lower the stock brackets and it was about 1.5", this allows me to retain seat travel and lose little, if any, knee room under the bolster. What I found out by lowering the seat in this manner is that the lower I went with the bracket the more seat the oriented closer to the bolster because the bottom back of the seat would rest against the rear tub. So you could go lower (cut out more material) but the seat will have to move forward to avoid resting on the rear tub when installed. For me, that's a problem because with the OEM, un-modified seat brackets, my knee was already against the bolster with the seat moved fully back.
It's VERY important, however, that the identical amount of material is removed from both tracks AND they're identically oriented. In other words, cuts and positioning needs to be identical otherwise your seat travel is going to be a problem.
Really not a bad modification to perform if you can work a RotoZip, a basic welder....measure twice and cut once!