Already have the fronts, found the right size and upped the ply count. Trying to do the same for the rear. Stock is 6 ply Titan. Titan makes, or made, these in 6,8,10 ply, 33.6 tall. Cant find the 8 ply, and the 10 ply that I got last week were defective, so they were returned. Spoke with...