This item is for rebuilding side feed fuel injectors. Side feed injectors are used mostly on Merc Optimax and Nissan engines. O-rings and filters come in various configurations and sizes and may not always be available in the aftermarket for your particular injector. We will advise you if this is the case. Please leave all the parts on the injectors when shipping them in to us. Please go here if you were looking for TBI services.
Injectors are only done in whole sets. So, if you have a 3, 4, 6 or 8 cylinder engine, you need to send in that many injectors.