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Not sure but I think the SR injectors should use the same o-rings as the KA injectors. You can buy a 'fuel injector seal kit' at the parts store which has a large and small o-ring. I'd replace the large rubber o-ring insulators if they are cracked or crumbly. BTW smear a light coat of oil on those insulator o-rings when you re-assemble and drop the rail in.. it will make installing the rail about 100x easier.
Not sure about the SR manifold gaskets, but the KA and RB have a paper gasket between the upper and lower manifolds so I'd assume SR is the same. I believe you can replace it with pure RTV with no side effects.
BTW if you put new injectors into your fuel rail, I suggest after you get the injectors bolted into the rail that you hook the rail up to the fuel lines and pressurizing it (key on only) before you bolt it down. This way you can check the bottom of each injector for leaks. If one of the (small) o-rings doesn't seat properly you'll leak fuel on that cyl and have to do the job all over.... Ask me how I know.
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