aftermarkets parts

hey hi before all, im new here and need some advice/informations

i own a 2000 mxz 700, and its now time to change some parts from my clutch/ sec pulley

i want to buy a clutch kit, Heel Clicker, and i also need to rebuild all the mobile parts from my clutch.

i want to know if i have to buy a rebuild kit from genuine skidoo parts, and also a clutch kit (Heel Clicker), or if the aftermarket kit will come with all parts that need to be changed for a 10000 km sled

i also had the idea to get some K&N air filter instead of oem airbox, is it specially good if im riding a lot in deep snow?

and another question , which clutch model is in there ?! TRA TRAIII or TRAV
never found it in all books i got lol

thx, for all can help me