My '18 Chevy Malibu drivers side electric seat can't move the base seat forward or aft because the part below broke where it connects to one of the frame rails via two pegs.

What is this part called? I can't find it in any diagrams and am hoping I don't have to buy an entire seat!

It'* probably called a seat adjust motor assembly or similar.

You might get lucky, but I think you're going to have to buy the whole seat adjuster frame. Not the whole seat though.