Similar thing happened to me 2 yrs ago.....Called an auto glass shop (small independent guy) and he said bring it in and he would custom make one for me....
Very easy for me to get the glass (what was left of it) and frame out..took it in and a few days later new window........Cannot tell any difference between the new and old glass...He did a great job and it was very reasonable........
On my MH I just removed the small rubber seal and it was quite easy after that (do not recall exactly how I did it, not at the MH now).....
