G1 Wheeljack's vehicle mode had the forward spoiler, and formed his toes inrobot mode. The forward spoiler feet is one of the more distinctive elements of G1 Wheeljack's design, which is probably why both Energon and (IIRC) Cybertron Downshift's feet had similar detailing (even though they weren't formed from the forward spoiler.)
http://en.wikipedia.org/wiki/File:La...atos_Turbo.jpg