Heres the info
The set comes mounted dual on a single stem. (The website shows the set with the individual perch mounts. Part number for the silver and black color combo is 560-122.)
I simply bought a longer chrome screw and spacer for gauge mount base plate and all done. They are a little pricey, but the quality is excellent.
Bobby,
My Gipro is mounted on a cheap Formotion clock 1 inch handlebar mount, around $18 on any site that sells the clocks. I just cut a small piece of aluminum for the velcro.
Rusty nice to know you are still hanging in there also.
George