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20D - 3.10 Bumpers / Side Rails

Any bumper or side rail that has been damaged or flattened beyond repair during an Event will not be permitted. The bumper and side rails must be acceptable to NASCAR Officials and meet the following minimum requirements: A. remains the same.
B. Rear bumpers must be made from an I-beam extruded from aluminum. The width, when measured across the rear of the car must be a minimum of 48 inches and a maximum of 50 inches and be mounted on centerline of the rear sub-frame rails plus or minus (+/-) one (1) inch. Each end of the rear bumper (from the mounting side) must be cut square and capped with a minimum 0.125 inch thick aluminum. All bumper caps must be welded and sharp edges must be filed smooth. The minimum I-beam size permitted will be 2-3/4 inches by four (4) inches by 3/16 inch thick. The bumper must be mounted at rear axle height. A maximum distance of 46 inches measured at the center of the rear axle to the rear edge of the bumper will be permitted. Bumper extensions must be a minimum of 1-1/2 inch by 1-1/2 inch square magnetic steel tubing with a minimum wall thickness of 0.125 inches. Bumper extensions may be welded or bolted directly to the rear sub-frame crossmember. If bumper extensions are bolted to the rear sub-frame crossmember, four (4) bolts per bumper extension must be used and be a high quality minimum 3/8 inch diameter solid magnetic steel. Bumper extensions must have a rear bumper mounting flange a minimum of 1/4 inch thick flat magnetic steel welded completely to the bumper extension. Four (4) rear bumper mounting bolts per side must be used and be a high quality minimum 3/8 inch diameter solid magnetic steel. All mounting bolts must have a minimum of 1/2 inch of metal from the center of the mounting bolt to the edge of the mounting flange (See diagram #10 in the rear pages of the Rule Book). Holes and/or modifications that, in the judgment of NASCAR Officials, have been made with the intent of weight reduction will not be permitted. Cars will not be permitted to compete without the front and rear bumper.
C. remains the same.