These are the same machined aluminum injector seats used in many Radium Engineering fuel rails. They are required when converting the OEM fuel injector to aftermarket fuel injectors. They simply press-fit into the intake manifold injector ports with no modifications required. Using the included FKM O-ring, they seal into the machined injector counterbore preventing vacuum (or boost) leaks. The injector seat bores are designed to be used with a common 14mm lower injector O-ring.
NOTE: Because they are compatible with different cylinder engines, the injector seats are sold individually (not a set). Change quantity accordingly.
Features
-CNC machined 6061 aluminum
-Laser etched logo
-FKM O-rings
20-0216 TOYOTA INJECTOR SEAT
20-0216 is used to convert side feed injectors to top feed injectors. 
COMPATIBILITY
2JZ-GTE
2JZ-GTE VVT-i
1JZ-GTE (Non VVT-i)
NOTE: There are other engines that are compatible but have never been verified.
20-0516 TOYOTA AIR ASSIST INJECTOR SEAT
20-0516 is used to convert Toyota air-assist injectors to standard top feed injectors. 
The Toyota air assist injector seats are anodized black, as shown below.
COMPATIBILITY
TOYOTA 2JZ-GE VVT-i
TOYOTA 1UZ-FE VVT-i
TOYOTA 3UZ-FE
NOTE: There are other engines that are compatible but have never been verified.
20-0848 TOYOTA INJECTOR SEAT, 20MM
20-0848 is used to convert side feed injectors to top feed injectors.
These injector seats are anodized black, as shown below.
COMPATIBILITY
1990-1999 TOYOTA Celica 3S-GTE (2nd/3rd GEN)
1990-1999 TOYOTA MR-2 3S-GTE (2nd/3rd GEN)
NOTE: There are other engines that are compatible but have never been verified.
