So I have the 2 injectors, one is pictured; in the other picture is the kit for the installation, which includes new gaskets, screws, Banjo bolt with washers; but what are the 2 brass threaded items with the o rings for? It shows they screw into the unit on the left side that holds the injector in place. The service manual makes no reference to these and how to adjust. I see no reason to even mess with them.