I just purchased a 2012 X5 35d as well (not as nice a color as yours). I have the same plans as you and I found the running boards on eBay for $245. I also found the OEM hitch kit, which comes with a bumper trim, but was also wondering how it integrates with the factory bumper (or if it's for the 2007-2010 bumper). That Execuhitch looks pretty nice, but is pricey, and I already have several class III receiver accessories that won't work with the Execuhitch