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Are you planning on changing them out yourself? I do not suggest you do so. Paying the fee to have the swapped and pop tested is well worth it. When I got mine swapped it cost only $21 per injector, and came with new orings.
I'm betting that a diesel shop won't charge any different if you bring him an injector, and a new nozzle, compared to bringing him an injector with a new nozzle in it. I strongly suggest to let the guys that do it every day handle it.