What is the correct size of injector seal ring?

I bought new injectors and four injector seal rings (5mm thick) for injector bore on IM. but while I research about replacing injectors, I saw that D16A6 needs 7mm thick injector seal rings. Is that right?
I am talking about not injector o ring but seal ring, bottom one.
Thanks
I am talking about not injector o ring but seal ring, bottom one.
Thanks
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