That is a bell crank. I doubt you'll be able to find one like that though as they went out of style a long time ago. They introduce extra slop into the system and are an added failure point. If you will run two golden rods or steel rod in a tube pushrods back to the elevator that connect at the servo you'll get the same result with a much stronger and tighter connection. There are a number of different ways to join the pushrods at the servo end depending on which ones you choose. A 2-56 coupler can be made by drilling the right size holes in a piece of HDPE or even tapping a piece of aluminum. Or if you know how to solder (that doesn't mean just watching a youtube video about it) you can use plumbing solder or Stay Brite silver bearing solder to join them. Wrapping them with thin copper wire before soldering will give you an indestructible joint. And, of course, there is always option 3, which is to run two elevator servos.