anyone know the part number to the rain gutter adapters?? I tried searching the net but the web sites were not clear on which ones to get. I just got a rack for cheap from a local guy who is moving but he didn't have the adapters.

 

I believe this page will help:

http://www.surcoinc.com/R-Mountingacc.html

3rd item down, I have the GM100. Super strong, but come with some rubber edging on both parts of the clamp, to protect your paint I figure. I had to take one off so I could open my back doors.