Differential Pinion Seal. National Seal/Bearing. Soft Fork is a Distributor of New and Remanufactured auto and truck parts. Part Number. Part Numbers. ADVANCE/DRIVEWORKS, AUTOZONE/TIMKEN, BCA, COAST TO COAST AUTOMOTIVE PRODUCTS, O'REILLY PRECISION, PARTS PLUS BEARINGS & SEALS, SCHAEFFLER USA, SCHFLR CAN-DROPPING USE SCHFLR USA/FGA, TIMKEN, WJB.