First, I just need to make sure I understand the sealing system of the fuel rail/injectors on my 2g. The seal at the bottom of the injector seals the injector to the head (and all four leak quite badly right now and need replaced). Some have referred to these as insulators. The o-ring at the top of the injector seals the injector to the fuel rail. Also, there are two o-rings at either end of the fuel rail (between the high pressure fuel line flange and rail and between the fuel pressure regulator and the rail). Questions: 1) Can I get these o-rings and seals/insulators at Autozone/Carquest/NAPA? Maybe injector o-rings aren't sold without new injectors. If not, where do you suggest I get them? 2) Will I actually end up with the correct parts? If not, where do you suggest I get them? 3) Should I ask for injector seals or injector insulators? Autozone has the throttle body gasket in their computer as a "fuel injector gasket", so who knows if they'll cross reference it correctly. 4) Is there only one o-ring per injector on the stockers? I know some other larger injectors have 2, and I want to purchase the correct number. 5) Should I bother replacing the o-rings or am I risking a fuel leak for no good reason? I've never done this, so if I'm safe leaving the old ones in (I have no fuel leaks), that'd save me some time and save me the risk of finding out after I pull the injectors that Autozone gave me the wrong ones. Thanks!