Share with me some the methods of coming up with the exact position of where to drill the holes for frame sliders. I have thought of perhaps using carbon paper on the inside of the plastic and then mount the sliders on the interior. Give a push and let the carbon paper outline where to drill.(just a thought) Also, to have the installation look as clean as possible have any rubber grommets been seen that could slipped over the drilled hole. I've seen this but I don't recall where. I'll be at mid-ohio for track day this year and I'd rather be safe then sorry. thanks, Todd in Cincy.