O-rings for fuel injectors - LS1 LS2 4.8 5.3 5.7 6.0 Manifolds GM LS2, LS3, LS7 Intake Manifold Adapter Fuel Injector O-rings 6.2 7.0 Set of eight (8) custom molded injector O-rings designed to allow you to install standard injectors LS1 4.8 5.3 5.7 intake manifolds. These O-rings are also needed when using a LS2 LS3 LS7 injector in a LS1 style intake. Only the bottom O-ring needs replaced in this application. These injectors O-rings are molded out of Viton like the production O-rings. Sold in sets of eight (8) pieces 14.5mm OD 7.7mm ID 3.5mm thick Note: When installed on the bottom of L94/L9H injectors which have a larger ID, these O-rings will give you the 15.5mm OD necessary for those injectors to fit an LS3 intake manifold.