This is a picture of a 2011 Pro with an anti-stab installed. Notice the measurements. There should be nothing ahead of the little wheels of the anti-stab kit. Be sure to taper the leading edge of the hyfax a little. You will not have to re-install the rubber rail tips. Notice that this sled has two limiter straps, we recommend that you add one. Finally, make sure that the small wheels outside the rails miss the rubber drive bumps. Depending on how your drivers are installed, the track can move left and right. If the tracks move enough that the wheels contact the drive bumps, these wheels will be torn off.