I got mine off amazon and it attaches to the mounting pad that came with my old GPS unit. Amazon also sells mounts that attach to the front passenger seat bolt and it comes up to the side of the radio like you're talking about.

 

Hey Matt did you look at this one?



I admit I don't know much about it, but it might be worth also checking into

Carshow link

Link to for it. Much "cheaper" here.

But if it's not your cup of tea or it's not proven tech that's ok too

 

Check this out...