Fuel Injector Adapter - O-Rings - Aluminum - F.A.S.T LSXR Intake - GM LS-Series - Kit This kit allows the use of the factory LS3/LS7/L76/L99 fuel rails with our FAST™ Part #146102 LSXR™ Intake Manifold. 146025-KIT Includes: (8) Injector spacers (8) O-Rings for use with spacers .