I mounted mine 1.5cm back of classic (192s). They moved the mounting lines up on the 07/08s a little bit. Apparently classic, or just back of classic is the money spot. At least on the 192s, I still have a lot of tail. Maybe go classis or 1cm in front if you're on the 181s.
~~Phunkin Phatt Phreerider~~
West is Best