well, the 88.7" is too short too. i could get it on if i also bypassed the tensioner, but i did not think it was a good idea to bypass the tensioner, so i went back to the 89.5". 89.5" fits ok, but there is just not alot of room left for the tensioner.
i think if i could get a 89.0", that would probably be the length i would end up with.