I called the carb king and he said that the 2100s kit did have that part. I have not ordered the kit yet, because I have not yet been able to remove the idle screw, and I have not been able to remove the diaphram rod.
The idle screw seemed like it was turning a bit, and I was working it back and forth. Then the head snapped off. I thought I might spot weld a nut on it and try again. The screw is made from steel, although the replacements are brass.
Thanks for the offer on the rod. I may take you up on it depending upon how things go.
Kurt