O ring between cam housing/cylinder head and the valve cover for the misters/squirters. There are two of these total on the 2GR.
OEM or Equivalent Quality/Brands
Toyota Part Number(s): 90430-A0001
Tach Adapter - R2
2GRFE MR2 SW20 Motor Mount - R2
Flywheel - Fidanza V6 2GRFE
Flywheel Bolts - ARP 2GRFE