Choke pull off diaphragm mounts on the rear of GM Rochester Quadrajet Truck carburetors. This diaphragm accepts 2 links. 1 link goes up to the secondary air valve and the second link goes behind the choke housing. The links do not come with the choke pull off. You need to reuse the ones that you have. Although you can see 1 slot clearly in the picture there is a second slot directly behind it slightly longer.