I recently ordered an upper gasket kit for the 420a from Felpro. I got the one that comes with MLS head gasket, gaskets for valve cover, sensors, intake manifold, exhaust manifold, throttle body, valve stem seals, front cam seals... etc. The problem is there is a pack of 8 small O-rings that I can't identify. They are about as big around as a dime, external diameter. If I need to post some pics I will, but I want to be sure I don't send this head out to the machine shop and find out later that those orings were something internal that needed to go too. Thanks