Pulley side main bearing race for “80mm” Hirth roller bearing crankshaft.  The 80mm crankshaft fits four cam engine types 547 (550 Spyder), 547/1 (356 Carrera 1500GS or GT), 547/2 (550A Spyder) and 692/0 (1958 356 Carrera 1500GT)

This race measures 80.06mm on the outside diameter and 65.04mm on the inside diameter.  The inside diameter has been resurfaced to the correct factory surface finish with no taper or bell mouth.  Ready to go.