Inner shaft oil seal for rear axle. 8N s/n 486753 & up, NAA. Priced & Sold only in pairs. 8N4233A-PAIR$7.70 Davis Tractor Parts Ford 8N Dept 24263 Antioch Rd. Andalusia, AL 36421 Phone: 334-222-7214 Fax: 334-222-0025 Email: parts@davistractor.com