I lucked out when I bought my Garmin Niv 260 3.5.. Both cars, I didn't need to make anything to hold the GPS. The Buick I can stand it up (it leans back) in the depression infront of the Radic/HACV controls. On the Bonneville I set it on top of the ashtray door and push it slightly closed and the lower knob on the radio wedges against the top of the GPS.
My suction cup mount was defective out of the box. It would come undone off any flat smooth surface after 2 minutes. Completely useless.
I have an old garage door opener sunvisor clip I make rig up on a small piece of wood or aluminum with velcro attached. Then I can try hanging it from the passengerside sunvisor.
We are men, we have hands... and we can "Build" things...
I built red oak mini consoles for both cars and some day I may make up some type of bracket that will fasten to the console in someway. I don't like driving and having everyone (I pass) see that I have a GPS on the dash. Prefer to keep the stuff low and out of sight.
Good Luck
harryface
91 Bonneville 320,434
05 Park Avenue 92,412