It has to do with amount of movement the cables have on the cable slide. The parallel limb bows don't have a lot of movement so they designed a new rest to work better on them. I know my original Muzzy will not work on my 2004 Mighty Might, but works fine on my girlfriends Alpine micro. Both are shorter bows, but hers does not have the laid back limbs.

I would contact Muzzy, they could tell you for sure which model would work best for your bow. From what I understand they are pretty helpfull when it comes to these rests.

By the way, I love my Muzzy. After trying a few of the other models if I were to get another drop away it would be a muzzy Zero Effect again.

Paul