Silverline bearings are made with a steel backed center main bearing to prevent premature wear. Silverline is an OEM quality replacement bearing from Mexico. These bearings will fit 1200-1600cc VW aircooled motors. Available in sizes to fit most crank and case combinations. Please be sure to verify your Align Bore Size, Crank Journal Diameter and weather or not your case has been thrust cut before placing your order for Main Bearings. Please be sure to verify your Crank Journal Diameter before placing your order for Rod Bearings. Sold as set.