New ‘69 Roadrunner owner here with a couple of very basic questions. Pictured is one of my front wheels. What kind of a “valve stem” is that & how would I check air pressure or inflate the tire? It’s almost flush with the rim, and the familiar little “push to inflate” brass peg seems to be hiding inside there. It’s internally threaded, so is there some sort of screw-in adapter that I need? Both of my front wheels are like this (the rears are the same wheel but they have the black rubber valve stems that I’m used to). On another note, are these “Magnum 500” wheels? Were they OEM on the ‘69 Roadrunner?