There will be two rectangular holes for the grommets. If your Y-pipe has round holes, you need the A3 blanks. If your Y-pipe changes size a few inches below the blank, you have a one-piece manifold V6 Y-pipe and need an A2 blank. The replacement part is made from high quality materials and well tested by the manufacturer. Please check the part numbers carefully and compare the pictures provided to ensure a proper fit. Note: These will not work on V6 engines that came with one-piece manifolds (use 807166A2, it has a flat tip), or early V8s with the round pin going through the flapper. Used on many stern drive V8 engines. (Some V6s come with the two-piece manifold/elbow) If you've ever overheated, they tend to get damaged. Sometimes you'll find pieces of them in the exhaust when you remove the drive for service. Help prevent oil from entering the engine through the exhaust. Condition: Brand New Size: Approx. 15.6 x 7.9cm (6.14 x 3.11inch) () MPN: 807166A1 Compatible with: Fit for V6/V8