This set includes 6 stainless steel fuel injector adapter bosses to fit 14mm injectors to 16mm injector seats.
Needed when installing standard 14mm injectors to 16mm injector seats (found on 2JZ-GE non-VVTI and 2JZ-GET Intake Adapter Runners).
The injector bosses are designed to be press fitted. Seals gas tight. Install with light taps (plastic hammer).
For permanent installation, you can apply thread sealer/locker.