This is an aftermarket replacement part, not an original equipment Please make sure your original part's measurements are the same as the listing description Please check the product pictures, description and specifications before purchasing If you have any questions, please contact us, we will provide you with the best service within 24 hours Flat Idler Deck Pulley is a compatible replacement for John Deere AUC10172 and GY22355. These pulleys measure 5-1/2" In Diameter and have a 5/8" center hole. They are 1-1/8" wide. They fit Z335E ZTRAK (with 42" Accel Deck), Z525E, Z535R (54" HC Deck, Z540M, Z540R