A lot of height is going to depend on the L brackets that you use too attach the seat to the bracket. The BC ones come with a rather tall bracket which is fine for the front but rides a bit high in the rear.
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You may need to fab something up if you're tall like me. I got a 2x2" 5/8th steel angle bracket and made my own L brackets that did not obstruct the harness belt holes and sat much lower. You can see them at the back of the seat in this pic.
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