Hi Solanum,
the following link is for a book that I have found invaluable for providing stuf to look for thru your new bins.
http://home.st.net.au/%7Edunn/heavensabove/
When I bought my 20x90 bins from AOE, I bought their suggested mount along with the bins. This is currently priced at $179 and is part # HVT11 at the bottom of the bino's section
Cheers,