sorry to reopen ancient thread... but maybe to closeout this topic...
Here is the link to the Fit Guide for Thule in 2012 that lists the fit kits for the older Thule 400 Aero series towers. There is a fit kit listed for the 2006-2010 M35/M45 but not 2011+.
http://images.atgstores.com/pdf/6304/th ... -18-12.pdf
The fit kit is listed as #2177 is for older Thule Aero 400xt towers (400xt are square bar, the 400xtr are aero bars). There are no fit kits that I found googling on the newer Thule systems (or on their website). Yakima similarly says they don't support that gen M35/45, and couldn't find a similar guide for their old Q clip system.
Looking around, there are people selling Fit Kits for the Aero/400 system, but can't seem to find a 2177 fit kit.
Rhino Rack appears to sell a new/current rack - model 2500 - that has a fit kit - dk210 - that it says fits 2006-2010 M's.