Funny, (not really), just went through this last week. Only it was all my fault. I thought I could slide myself between the bed and closets in our Aria to get to something in the back bathroom. Too lazy to put out the slide or just crawl over the bed. Anyway, I hit the mirror with my butt and broke it. Called a couple local glass places with the dimensions, in our case 48.25 X 19.5 by 1/8" thick, and had a mirror in a couple of hours for just under $60. Carefully peeled the old mirror off the backing, put new mirror on backing, let dry overnight and installed the next morning.
Vicki and Mike, Aria 3901- The Wined Up Bus