This is a A-56770 Belt, Ground Speed Reel Drive PN: 56770Main Description As Following : A-56770 Belt, Ground Speed Reel Drive P.N: 56770 Dim A (1): 5/8" x 84"Replaces: 56770 Stocked As: A-B81 , Crosses To: A-B1B81 HESSTON 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 : Dim A (1): 5/8" x 84" Replaces: 56770