Fuel injector o-ring, bottom of the injector. Sold individually. Full set of 4 on an engine.
These fit all 16v 4AGE and 4AGZE engines. They also fit all 5SFE and 3SGE engines. They do fit Gen3+ 3SGTE engines but they do NOT work on the Gen2 3S.
OEM Toyota Part Number: 23291-41010