OEM Part Numbers: AM121238 Fits Mowers/Tractors: 180(38/46/48in), 185(38/46in) Fits Mowers: GS25, GS30, GS45, GS75, HD45, HD75 Fits Mowers: S80, S82, S92
Flat Idler Pulley Flat idler pulley for many mower decks. Designed to contact the flat side of belt.
Also order 24H1864 flat washer
  Measurements: 4.000-inch effective diameter 0.379-inch bore 0.800-inch groove width 1.000-inch overall width SteelReplaces AM35590