836,001 to 880,000. Pto clutch for 717-3340 oem upgrade high torque conversion kit. 6.0 pulley 836,000 to 864,500. This item can be shipped worldwide. XMCI also states OEM Upgrade or Warner Upgrade only refers to the billet pulley, the use of stainless steel braking rivets, replaceable pulley bearing, Xtreme wire protection system, and Cool coil technology, most of which are unique to the Xtreme Mower Clutch product line.