I think I trimmed about 1 1/2" off the top of the riser. Because the base of the seat was tilted back at an angle I had to trim the riser level with the floor to get the correct comfort for my fat but. I just took a piece of duct tape and used it as a guid for cutting the riser.
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Because I trimmed the original factory lip off the top of the riser it left the riser somewhat flimsy. so I went about reinforcing the inside perimeter of the riser with some 1" square stock. This is all pinned in with about 16, 1/4-20 bolts, and lock nuts. This not only stiffened the riser bak up but also gave me a structure on which I could reinstall the factory cross sills and mount a base for the mounting brackets.
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Next up was making 2 filler plates out of 16 gauge on each end of the riser. This would give me a surface to mount the seat brackets to.
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