CAM4545 X1. CLASSIC MINI HEAD NUT. THESE ARE THE LATE TYPE FOUND ON ALL A+ ENGINES BUT WILL FIT EARLY ENGINES THESE DO NOT REQUIRE A WASHER. CLASSIC MINI SPECIALISTS. ALL ENGINES FROM 850 TO 1275. THESE ARE SOLD SINGLY AS 9 ARE REQUIRED PRE CAR WITH 10 REQUIRED FOR COOPER ENGINES.