Holes: 1-1/4 Diameter (2 holes in one side & 1 hole in the other). Bolts: NO (will work with stock OEM bolts). Listing: This listing is for Valve Covers ONLY.Actual Valve Covers (NOT Caps). Note: Not compatible with Factory oil cap, breather and PCV Valve. Must use "Push-In" style breather caps with rubber grommets (NOT Included). Fits Chevrolet C1500, Chevrolet C2500, Chevrolet C3500, Chevrolet C3500HD, Chevrolet Camaro, Chevrolet Caprice, Chevrolet Corvette, Chevrolet K1500, Chevrolet K2500, Chevrolet K3500, Chevrolet Monte Carlo, Chevrolet R20, Chevrolet R30, Chevrolet R3500, Chevrolet V30, Chevrolet V3500, GMC C1500, GMC C2500, GMC C3500, GMC K1500, GMC K2500, GMC K3500, GMC R2500, GMC R3500, and GMC V3500 models. Take advantage of this super low price, only while supply lasts! This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts & Accessories\Engines & Engine Parts\Valvetrain Components\Rocker & Valve Covers". The seller is "spperformance1" and is located in this country: US. This item can be shipped worldwide.