THIS IS THE GASKET & O-RING USED FOR THE CAB LIGHT CONVERSION TO GLASS LENSES.  THE FOAM GASKET HAS TWO SCREW HOLES, WHICH ARE  ARE 3 INCHES CENTER TO CENTER OF THE HOLE. THE O-RING SEALS THE GLASS LENS TO THE TRIM RING. THE FOAM GASKET IS TO SEAL THE BASE TO THE MOUNTING SURFACE . NEW. BULK PACKAGING.