Lazer Z CT sn 370,000 & Up. TimeCutter 17-44ZX (74401, 74502, 74601) serial no. TimeCutter 17-52ZX (74701) serial no. TimeCutter 18-44ZX (74602) serial no. TimeCutter 18-52ZX (74405, 74801, 74702) serial no. TimeCutter 19-52ZX (74802) serial no. TimeCutter Z16-44 (74501 & 74502) serial no. TimeCutter Z17-44 (74401 & 74601) serial no. TimeCutter Z17-52 (74701) serial no. TimeCutter Z18-52 (74801) serial no. Z Master Z400 sn 250000001 – 280999999. Specs: 1.000″ Crankshaft, 7.19″ Pulley, Counter Clockwise, A/B Belt, 125 ft. Pictures shown are for illustration purposes only and do not necessarily represent the actual product. Please Message us if you need Model Lookup Assistance. Please make sure that PO Boxes can receive boxes. (XMCI) of Boca Raton Florida. XMCI does not imply any association or affiliation with any OEM Manufacture including Warner Electric, Ogura Industrial Corp. John Deere, Exmark/Toro, Hustler, Husqvarna, Cub Cadet, or any of its associates or affiliates, trademarks or copyrights. 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.