I have these on my car. I have a garage to do the swap if you are local. Used in very good condition. Great step for short people, very sturdy and wide enough for a step.
$250 for a local sale and $300 for a shipped item to 48 states. (I live in NW Chicago burbs)
http://www.amazon.com/2007-2009-Acura-MDX-Running-Boards/dp/B006VYHRHI/ref=sr_1_8?s=automotive&ie=UTF8&qid=1359594662&sr=1-8&keywords=mdx+running+board (other places are usually little cheaper) INSTALL MANUAL
My ebay name is 98blkgt if you want to see my reviews.
some picture I found online what they look like on a car