Experience top-notch performance and perfect fit with the Toro OEM Hydro Drive belt 145 5727. This essential part number 145 5727 is meticulously crafted using premium materials and undergoes rigorous testing to deliver unmatched reliability in even the harshest environments. Don't settle for imitations or substitutes - trust only genuine Toro parts to fit your Z Master 2000 series mower. Please refer to the special notes and the model fit guide below to ensure proper fit. Note: Due to a SERIAL Number break within Models Numbers or Series, Some Model numbers might overlap with different Hydro Drive Belt Part Numbers. This is a difference between a metal versus plastic Drive Idler Pulley on the tensioner arms as well as a difference in body style. The newer I Beam frames on the 2000 Zmaster series will have a different part number than the older tube frame Models. The older body style - Z Master 2000 series take the plastic Idler Pulleys versus the Newer I Beam body style will take the metal Idler pulley on the tensioner arm. Refer to the list bellow and click on the appropriate part number to be redirected. PLASTIC IDLER PULLEY (ONLY OLDER Z Master 2000 series) HYDRO DRIVE BELT - 126-5993 STATIONERY AND TENSIONER ARM IDLER PULLEY - 116-2456 METAL IDLER PULLEY (NEWER I BEAM FRAME Z MASTER 2000 series) HYDRO DRIVE BELT - 145-5727 TENSIONER ARM IDLER PULLEY - 140-4964 STATIONARY IDLER PULLEY - 132-4718 Specification Product Number: 1455727 Brand: Toro Length: 92 1/10” Width: NA Height: NA Weight: 0.508 LB (0.230 KG) Model Fit: 77281, 77283, 77285, 77288, 77291, 77294