Piston Ring Set Fits John Deere 2 Cylinder Tractor 40 320 330 M MC MI MT MTN +One New Aftermarket Replacement 2 Cylinder Piston Ring Set that Fits John Deere Tractor models: 40, 320, 330, M, MC, MI, MT, MTN, MTW. With 0. 045" Overbore, 4. 045" Bore, (3) 0. 093" Compression Rings, (1) 0. 250" Oil Ring. *** PLEASE MEASURE YOUR OLD RINGS BEFORE ORDERING! Do Not order by Tractor Model Only *** Due to the many different Piston Manufacturers, there can be as many as 8 different Ring Sets available for one particular Engine. To ensure