This is a A-57513 Belt, Trim Steering, Forward & Reverse Drive Assembly PN: 57513Main Description As Following : A-57513 Belt, Trim Steering, Forward & Reverse Drive Assembly P.N: 57513 Dim A (1): 5/8" x 75"Replaces: 57513 Stocked As: A-CC155 Found in Section & Models : Belts > Hay and Forage Belts, Hesston SWATHER/WINDROWER: 300SP (1971-1972) Associated Items : New Also This is An Aftermarket Product And : Double V-Belt 7/8" X 159" Polyester Cord Dim A (1): 7/8" X 159" DBL ANG Replaces: 57513