Throttle Solenoid

Depends if you are looking for brand specific product, or to adapt something. You can also just hit the local pick and pull. Most brands have them, and if not you can use no brand knock off or combine/ adapt other brand parts to suit your needs, to include making your own brackets, electric connections, etc. There is also the decision if you want to go with electric or vacuum. In this case I am assuming electric which could be rigged up to function well, as you can connect it to the ac compressor lead. I found brackets and solenoids that could be made to work both as cheap as 12-15 bucks.

Using Carborator idk or AC compensation solenoid key words, gets you all kinds of web hits for ideas. Here are a couple of links that may be helpful.

Carburetor Solenoids and Brackets

Edelbrock 8059: Air Conditioning Idle Compensator Kit Includes Throttle Solenoid and Bracket | JEGS