I did some more checking for you.....
The shocks are only used in the 340-550 size sleds and some touring sleds. This tells me they are of the motion control hydraulic line of shocks. Meaning that after about 30 seconds of washboard or stutter bumps... they are completely compacted and of no use... you are getting tossed around the trails like a rag doll.
The front and rear arms are only used in the 800 during the 2001 model year.... but are still listed up to current for the smaller sleds. May be because of a different color....
My opinion is to pass on this skid... and find one much better. Pay close attention to shock packages as this is where the money is. My main reason not to use this skid.
You may also want to check out Ski-Doo SC-10II or even SC 10III...They are very much the same as the edge skid. The sc10 III has more travel than the SC10II.... but get one from a 2002, or 2003 ZX chassis (Legend, MXZ, etc)