I had also been searching for universal towing mirrors that will work with my 2006 Expy. Specifically the Eddie B. edition with the signals on the bottom of the side mirrors. I've finally found one that works OK. I picked up a pair of the Milenco Aero 2 mirrors. The key for those of us who have signals on the bottom of our mirrors are that straps don't typically work. These have no straps and clamp to the top of the mirror. I had the Expy up over 60 with the trailer and while they aren't totally vibration free, I much preferred them to the old straps ons that I was using. They are typically available in England and Australia and I was about to buy them on Ebay when I found them at
https://www.makariosrv.com/. Perfect, not quite...better than other options, definitely. They have a couple of size options and I'm happy with these mirrors. I found them on this youtube vid:
http://www.youtube.com/watch?v=W4aYTr0JLLU