This listing is for a New Wiseco brand piston kit made for Starting Line Products (SLP) to convert your Arctic cat 700cc machine to an 800cc. 

From what I found online, this will fit the following machines, may fit others too
2004-2006 F7 Firecat
2004-2006 F7 Firecat, Sno Pro
2005-2006 M7

Wiseco #9919M08400 Piston Kit

Change your F7 or M7 to a big bore 800 with these 84 m/m pistons.

Coated Piston

Piston kit includes Piston, Ring, Wrist Pin and Pin Clips.

Regular price $148.00 per kit.