I always use the mickey T site for what size tyre will go on what rim
http://www.mickeythompsontires.com.au/index.php?page=ATZ-P3
If you look at this a 265/70 17 if fine on a 7' rim.
Your tyre shop is making shit up.
http://s67.photobucket.com/user/conspics/media/Navara/Mirrorremoved.jpg.html
This picture shows where you need to get a flat head into and twist.
Ive done mine and it works.
I had these gauges in my GU with the optional lighting controller. They do dim well but I found when I got down really low they would start to flicker. From memory in the GU the lighting controller was needed, can't remeber the reasoning now tho.
I will be putting them in my 550 soon enough also.
Nope does not turn, the center is solid rubber.
not an exhaust hanger as its on both sides and the exhaust don't go near them.
What would they be a weight for?