55-57 Chevy Exterior Parts. 55-57 Chevy Interior Parts. 55-57 Chevy Rubber & Seals. 55-57 Chevy Manuals & Decals. 46-75 Chevy Truck Parts. THERE ARE 2 SIZES 5/16" AND 3/8". THIS IS THE SMALLER ONE. ALL CARS USED THE 5/16 EXCEPT FUEL INJECTION AND DUAL FOUR BARREL CARS.
