ok , i have been thinking long and hard about adding buttons to my car too, for various things.....
i have spent about 5-6 trips to the Junkyard finding and collecting switches from almost every Pontiac that is in production
looking in the Interior of the 00+ Bonnevilles, there is not a button that is rounded, this poses a problem because there are alot of Pontiac Switches that are square or have a square appearance to them.
Here is what i have come up with
ETS Switch off a Sunfire. the switch is a momentary, and has a nice small rounded edge body that would flow well with the Bonneville
Fog light off a 99+ GA...the switch is a latching so it makes it a little easier....again, this switch is EXACTLY the same as the Sunfire ETS switch, but has an indicator light built in.
as for changing the lettering, i have not as of yet...i have tryed and it has not went well...pretty much a totally failed attempy
....you prolly would need to get a sticker of somesort and apply it on...that is the only way that i can see it working
me personally, once i get the Fog light symbol and the ETS lettering off, i will leave the switches blank and go from there
PM me what you Doing Darcy, im always interested