Caterham front wings
Ferrari front brakes. Their cooling must be exceptionally efficient because the ducts are nearly flush with the tire sidewall.
RBR rear hub and brakes. I believe the flap at the bottom is a development new for this race.
The under-skin flow modifiers (silver) are just to the left of the gold heat shield. There's a big chunk of ballast at the bottom as well.
Mclaren rear hub.