Silber Injector replacement orings

Looking for replacement injector O rings or advice on to replace or not. They look good yet but would like to replace them as it goes back together. This is a 12 cylinder with the most recent reflash Silber turbo kit. Has the larger replacement injectors, not the additionals. Are the o rings the same as the stock replacement ones?

Also who is recommended for testing cleaning injectors?

Thanks in advance.

Just checked a couple of those vids out - that is about is simple as it gets! Thanks for that info!