source for wire link between halves of the seat track system

I know I've seen these for sale. I am looking for the stiff wire thingamajig (that's a technical term) that link the right and left sides of the seat tracks, so that when you pull the lever on the outside of the seat, the track on the inside also releases. Part of the problem is not knowing what they are called (thingamajig doesn't seem to work).

Before you say so, I know that I can make them, but the factory ones are so simple and effective...

This is for a 1970 Dart and the ones for a 1970 Challenger are the same.