For MGB 4cyl MGB 1800 5 Main Bearing. for MG MGB GT 1965–1980. for MG MGB MK IV 1980. Bolts: Including ARP 2000 3/8" bolts (Note: Extra cost for upgrading to ARP L19 bolts). ARP 2000 bolts ,Optional ARP L19 fasteners available as an upgrade；.