Tachometer Drive Adapter Assembly Fits Ford Tractor Fits:Ford- Fits the following 1975-90 (unless noted): 2310, 2600, 2610, 2810, 2910, 3230, 3430, 3600, 3610, 3900, 3910, 3930, 4100, (4110 1/1981 & up), 4130, 4600, 4610, 4630, 4830, 5030, 5600, 5610, 5700, 5900, 6600, 6610, 6700, 6710, 7600, 7610, 7700, 7710; Industrials: 230A, -755B (All w/ cam driven tach drive)- Specifications 2.170" O.D. base Replacement Numbers: Ford- 84405438, 87800006- 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.