1958-68 Pontiac Air Cleaner Grand Prix, Catalina, Bonneville - OE. Carb Opening Diameter is 4.25. We have seen about everything and are willing to guide you in the right direction to get the right product for your ride! This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts & Accessories\Air & Fuel Delivery\Other Air & Fuel Delivery".The seller is "restoreamusclecar" and is located in this country: US. This item can be shipped to United States.