ID=33.78mm, OD=39.88mm, Thickness=3.175mm

Designed for and guaranteed to fit StopTech big brake kit calipers. May or may not also fit assorted AP Racing, Brembo, Porsche, or other calipers.

PLEASE MEASURE YOUR PISTONS BEFORE ORDERING. SEALS ARE NOT RETURNABLE IF THE WRONG SIZE IS ORDERED.

(Supersedes discontinued part number 753.99002)