I just bought this one on Ebay for my Buddy 170I
http://www.ebay.com/itm/230907104935...%3AMEBIDX%3AIT
It works ok, especially for the price since there were much more expensive options. This one fits under the bolt that tightens the mirror down. I can't get my gps mount to click in the whole way, but it holds it well enough. I do love having GPS, i set it on avoid highways and it's shown me some really cool roads in my area that I had no idea about.