What do you call these?
 

I'm trying to find a replacement of these levers. They clamp on to a rotating shaft (for example, a carburettor shaft, or choke, or on electrical or hydraulic servo motors) and allow fitting of a ball or cable to the end to work the lever. They come in different shaft diameters and lengths, but to find a source of them, I need to know a search hotword like a brand name or generic type name.

Does anyone know what they're called so I can find a seller?

Linkage rod arms
 

Hi Tony,

Try linkage rod arms. I found a few suppliers such as Speedway Motors for 3 x 2 bbl Carby setups selling them.
https://www.speedwaymotors.com/Strom...Arm,37457.html
Cheers,

Throttle arms? Throttle linkage arms, and then go to images and pick the ones you like.

You may get some results with "bell crank"

I have found a few for specific applications (such as the Speedway ones for Carbs), but I want to find other dimension shafts and lengths, thus I was hoping for a manufacturer's site where you select the variables, say 5/16" shaft + 1 1/4" long = P/N abc123.

Try Hilborn. They do a 5/16 x 1.2 (not 1.25) They are bronze. SKU# F101

There's a pressed steel one at a business in Australia called "Series one shop"
No size given, (might be too big?) but also some interesting parts for the early Land Rover psychos.