Special thick thrust washer set for 1275cc based engines. If damage to the thrust face has occured, the cure is to machine it back and use thicker thrusts to restore original location of the crank. Also used when an A+ or Austin America crank is fitted to an original Cooper S block with narrow journal. Sold in a set of 4. You can mix these with other oversizes to obtain the correct fore-aft crank clearance.