I have switched Simmons skis between my 98 Mtn Max, 2001 Summit, 97 ZRT and now 2003 King Cat. The differnt part #'s are for the minor differences in each make... rubber pad, bolt hole size, width of saddle, etc. The 2003 King Cat has a larger diameter bolt than the other sleds, the Mtn Max has a wider saddle so being the simmons came originally sized for that, they fit all my sleds. I just drilled out the holes to fit them to the King. All you have to do is pull one ski off and see if the simmons fits?... If its too wide, add some washers (in or out to widen/narrow your stance)... if the bolt doesnt fit, drill it! (and I honestly dont worry a bunch about the pad, all it pretty much does is reduce the front-to-back motion in the ski) I put the ZRT (stock) skis on my 92 Exciter w/o the pad and ran it all year... made NO difference.