I'm 6'1" 250lbs - I'd like to see seat dimensions. Of course these probably wouldn't be necessary if I'd lose 50 pounds, but I'm pushed right up against the steering wheel. How thick is the back seat suppose to be? I think the bench seat in my truck isn't original. I'm hesitant to modify the truck's originality. Can anybody point me to seat dimensions - like height, length, width of the various components?