Going to change Super charger coupler
 

Hi, what O-rings need to be replaced on my Injectors when I take them out and put them back in? Thanks

There are two sets, one on top and one on the bottom. Just replace them all. That way it's done.

Are the two sets 2 sizes like 2 small ones a black one and a brown one? Also is the second set the same color black and big and round? Thanks I am just not sure what all to get I ordered the set of six the small ones with black and brown. Thanks for your help guy's

I don't recall if they are the same size. If the ones you have are in good shape you can reuse them.