Summary

These are the tabs that I used to mount my Boulder 15 solar panel to the roof of my shed. I used #8 screws through the roof coated in tar under the panel out of sight and the tabs here were used to push the panel down the slope of the roof to ensure that the screws on the underside of the panel stayed in their slots.

After mounting the tabs to the roof I coated them in tar as well to ensure a water tight install.
Sadly I'm not 100% sure what size screws the tabs were designed for. I used some that I already had laying around the garage but you should be able to match them up with something at home depot or lows if you want to do something similar.

Also see the model for the solar panel.
http://www.thingiverse.com/thing:1271516