They definitely have a bracket. My car had it on it when I got it, and I have another one that came off an engine from a Riveria I parted out 25 years ago. Also, here is a picture I just dug up of an all original Freemont built GS I parted out several years ago (Loren has this now). Alot of things on this car were original and un-disturbed when I got it, but body was way too rusty to save. If you zoom in on the pic, you can see it has a bracket with a metal clip that hold the valve into the bracket. It takes the correct valve for the clip to work--the ones you buy at the auto parts store won't work with the clip, but will sit in the bracket. The front corner intake manifold bolt is actually a studded bolt and the bracket mounts to the stud part with a flange nut.