Identify This Part Please!

Yeah - what he said...At least you asked....

My oldest son has watched me tinker around the garage for 16 yrs... Not until last year when he showed a real interest and we brought home his 65 B'cuda, did I realize I never really "taught" him anything about my car habit... So for all intense purposes, he's a newbie to the hobby and is learning a LOT of terminology and a LOT of stuff from asking those very same "what is this part?" questions....

Now tell us what car that part is on vanleer....