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It’s ok to have index 9 on one bank and index 12 on the other…yiu need a fresh decoupler for each removed / refitted injector ..
You’ll probably need the tip Teflon seal for each one removed too..
The seal will rapidly expand once removed if in good condition..if poor it will need replacing anyway.
I’d be very very cautious about unspecified sourced index 12 injectors , the market is flooded with knock off copies from China and also failed oe injectors that people are trying to off load..
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