I have had two seats done by this guy and throughly recommend him. He uses memory foam and the seats are ideal. Cost is £140 and he uses the original seat cover so it doesn't look like an add on. http://www.sussexmotorcycles.com/ Im 6ft so should be ideal for you. No slipping forward !! Don't be put off by the look of the place. It looks like a dump but the job he does is fantastic.