The 73 road runner{AC car} I'm working on had the old style{bakelite} valve originally...It has the bracket posted by RonM and there's no other holes on the inner fender suggesting it was ever swapped out...And , as usual its shot... ..Seems they all cracked and probably why they wized up and changed it out... But was'nt that bakelite{or phenolic as some are call it} valve used on trucks though the mid to late 70s ????....Nice part for job security though...