On a 1970 Mustang Mach 1 shaker air cleaner assembly on the opposite side of the oil breather element is another hole in the air cleaner. Does anyone know where to find the small assembly that fits in the hole and has a clip that attaches it to the air cleaner? Mine is missing. I believe it is part of the vacuum system and has one or two vacuum hose ports where vacuum hoses attach to it. Thanks so much.