Caltric Premium Quality Replacement Parts. Auger Drive Belt & Paddle Set. For Toro Snow Thrower. 38453 (621 ZR) – Toro 21 Power Clear Snow Thrower (SN: 311000001 – 311999999) 2011. 38453 (621 ZR) – Toro 21 Power Clear Snow Thrower (SN: 312000001 – 312999999) 2012. Length (Outside Circumference): 34.75 / 882mm. Width: 0.4375 / 11mm. Length: 21.875 / 555mm. MANUFACTURED TO MEET OR EXCEED OEM PERFORMANCE.