where to find Rohn non-penetrating roof mounts or similar mounts

We've used some FRM125 non-penetrating roof mounts made by Rohn:
http://www.rohnnet.net/rohnnet2001/catalog/menu/main.html

There's pictures, prices and specifications here:
http://www.youdoitelectronics.com/id289.htm

Unfortunately, as of today, You-Do-It seems to be totally out of stock 
of all of them and they think it might be months before their supply is 
replenished. Does anyone know of another source for those or might be 
able to suggest a good alternative? I'm guessing we'd need to mail order 
since I doubt there's another place near Boston that has them in stock.

   - Steve Ronan
     Cambridge, MA



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