the seat is out of a dodge dakota. not sure what you mean by how high it is. i made a riser out of square tubing to bolt the seat to the floor. Its about 5"s tall if i rem right. plenty of leg and head room, have to duck a little to see the stop light if your first in line, buts that's with any chop.

 

I have a 3 1/2" chop on my F1. Trying to get a handle on how tall of a seat I need. I am 6'4" and need the seat cushion as high as possible

Brad