I had the same problem when I bought a choke cable to install on my 54. I think what happens a lot is that people send in their carbs as cores and don't realize the replacement might not come with this stuff.
I got the bracket from Mothertrucker who threw it in when I was ordering some other nicnacs.
What I did though as a temporary measure is to take a metal bracket that is meant to hold down 1/2 inch metal electrical conduit. This looks like a little saddle with two screw holes. Bend the screw holes so they touch and you now have something that will capture the choke cable. Put the screw through the hole to tighten.
I ended up getting the real bracket from MT because it also is supposed to hold the throttle cable.
