I think you need that ring to seat the injector correctly. It might push out of the fuel rail up top under pressure too. Get your calipers out and measure ID, OD and wall thickness, then look through plastic washers on mcmaster
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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