This one wire electric choke fits inside your stock Pontiac (or, even a Chevrolet) choke cup. Comes with new screws (3) and plated clips (3). Fits 59 to 65 center carbs. Simple install. Provides choke when blocking the crossover. The internal tube in the manifold is a closed loop, so it is not necessary to block the ends. In this case, you can see the tips of screws used to block the tubes. I did not leave them like this. The tubes had been removed...so I had to block the openings. I ended up grinding down the heads of the screws so they looked more like a rivot.