If you can get your hands on one, grab it. I was offered a decent sum of money for each of mine (I have two from the factory in our Sovereign) and I turned it down.
If you want to take the time and make your own, there are several threads on here, which include dimensions. I took the time one day to measure everything out in our coach and posted with pics.
1971 Sovereign International - SOLD
2004 F-350 King Ranch
AIR # 8239