3090 x 1. A single Rear brake piston seal REPAIR KIT with handbrake boot. Same bore seal as earlier rear pison type (1 1/8"). The XK140 LATE Repair Kit for Rear Wheel Cylinder, Later Vehicle features an additional ring seals that sits below the top piston skirt. 2 x required per car. Original number KL71518.

IMPORTANT NOTE : These are not miracle kits and depend upon a very fine seal face, so if the bore shows any corrosion that cannot be polished off, ALWAYS REPLACE THE WHOLE CYLINDER AS A SAFETY CRITICAL MEASURE.