This is a A-738588M1 Ring Gear, Flywheel PN: 738588M1Main Description As Following : A-738588M1 Ring Gear; Flywheel P.N: 738588M1 Inside Diameter: 14.815"Outside Diameter: 15.913"Replaces: 730407, 31162121Teeth: 126Thickness: .690" Replaces: 31162121 MASSEY FERGUSON , 730407 NEW IDEA , Crossed From: AV102565 VAPORMATIC , 1209-5523 , Found in Section & Models : Engine Parts > Flywheels and Ring Gears, Massey Ferguson COMBINE: 8450, Massey Ferguson ENGINE: A4-236, Massey Ferguson ENGINE: A6.354.4, Massey Ferguson ENGINE: T4-236, Massey Ferguson ENGINE: T6.354-4, Massey Ferguson INDUSTRIAL/CONSTRUCTION: 80, Massey Ferguson SWATHER/WINDROWER: 885, New Idea UNI HARVESTER: 706 (Lot # US 206 & Above), New Idea UNI HARVESTER: 707D (Lot # US 205-216), New Idea UNI HARVESTER: 708 (Lot # US 221-291), White/ Oliver/ Mpl Moline COMBINE: 7300, White/ Oliver/ Mpl Moline COMBINE: 8700, White/ Oliver/ Mpl Moline COMBINE: 8900, White/ Oliver/ Mpl Moline COMBINE: 8920 Associated Items : New Also A-MH-O-MF70MF80, A-MH-P-MF80TLB, A-MH-S-MF7080 And : Inside Diameter: 14.815" Outside Diameter: 15.913" Replaces: 730407, 31162121 Teeth: 126 Thickness: .690"