Among the stuff I got from a guy who was parting out a Suburban was what I assume was the factory roof rack and rear "spoiler" looking unit. It took me a while to find a good photo, this looks like what I have: http://carphotos.cardomain.com/ride_images/1/2008/4141/5019570099_large.jpg I didn't bring anything with me to measure the location of the mounting holes in the roof to mount them. If anyone has these mounted on their Suburban could they give me a measurement from the top of the rear door opening to the position of each of them? I can center them, I would just like to be sure how far from the rear of the roof they usually are mounted. I'm thinking a fabric measuring tape like my wife has in her sewing kit would work pretty well to follow the roof line but I'll take whatever I can get. Thanks!