Piston Ring Set Fits Massey Allis Chalmers Tractor Fits: Massey- MF: 135, 150, 230, 235, 245 With Continental Z145 and 3-3/8" bore, (3) 0.125" compression, (1) 0.187" oil ring- Allis Chalmers- B, IB, C, CA, RC, (D10, D12 both up to SN: 3500) With 3-3/8" bore, (3) 0.125" compression, (1) 0.187" oil ring, JJAB2070 Replaces: 230093, 9017908- Specifications 3-3/8" standard bore, (3) 0.125" compression rings, (1) 0.187" oil ring Replacement Numbers:Replaces PNs: Massey- 836100M91- Allis Chalmers- 70230093, 79017908- Measure old rings before purchasing. Do not order by tractor model only. Due to a varied of piston manufacturers, there can be as many as 8 different ring sets available for one particular engine. To ensure you order the correct rings, we will need the following information: 1.) Bore Size. 2.) Thickness of each Ring. 3.) How many of each Ring Thickness per Piston. Rings CANNOT be returned if opened. All JJAgParts items have been hand selected by our team and are continuously monitored for Quality. Should a craftsmanship or fitment concern be identified, JJAgParts will work with you to stand behind our products. JJAgParts is an American owned and operated family business! Here at JJAgParts, we strive for customer satisfaction. If you are not satisfied with your order, please contact us so we can make it right. Note: OEM Part Numbers are for reference only and should be verified before purchase.