Scoob,
Wish I was 6ft3, I'm 5ft6 but the 6 inch part is my legs (no more comments please).
My bro inlaw is 6ft4 and does sit a lot higher but he has a 10ft arse and does'nt sit neatly in the seat.
The width of these seats even allowed enough spare room to glass in some door sills aswell. Personal view but needs them to finish area. You can see seat mounting point in pic>
Hope this helps a little.
Dale.