I extended my passenger backrest by 4 to 5 inches in height. I could have bent the steel plates that I made forward by using more length and bending it several ways, then cut the excess off to the height that I wanted for the GF. I've got pics that I put up several months ago of the finished rest. Making it go forward more in your case would have been another 2 minutes in the vice, THEN drill the 4 holes for attachment to the top rest.