This is the belt which goes from the engine to the gearbox to drive the wheels.
EMSea Lawn Mower Transmission Belt Idler Pulley 722337 Compatible with Hayter Heritage 13/40 15/40 19/40 Lawnmower
Hayter Heritage RS82 Ride On lawnmower Rear Drive Axle Transmission Gwo
Transmission Drive Belt, Hayter Heritage M10/30 Codes 133 Ride On Mower MU37x110
Genuine DUNLOP HAYTER Heritage ST38 150A ST42 151 TRANSMISSION DRIVE BELT 37X121
Hayter Murray 13/30 12/30 12hp30 1330 12 30 deck blade drive belt 37x74 1992 on
