Features include high performance electronics, centerless ground shaft and high dielectric strength cap with balanced rotor for trouble free performance. HEI cap dimensions: 5 1/4" wide x 5" tall. Can be easily converted to mechanical advance.Supplied with clamp down distributor cap and rotor. IMPORTANT : This item will fit ONLY those applications provided above and will not fit any other applications. The item "Blue HEI Distributor Coil 8.5mm Spark Plug Wires Oldsmobile 330 350 400 425 455" is in sale since Sunday, July 30, 2017. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Ignition Systems\Distributors & Parts". The seller is "maxx-performance-products" and is located in Hackensack, New Jersey. This item can be shipped worldwide.