I would contact Andy at Inland RV. His quote for mine was cheaper than $184.20. I told my husband from here on out he is not allowed to close the windows.
But I think it would have broke even if I were to have gently shut it. This might be what happened to your son in trying to close it. They surely are not windows you can force shut. And if you are not careful lowering the glass they can fall shut. This is why I like two of us shutting the large front and back windows. Someone inside to unlatch and latch it and the other person to help gently lower it.
Good luck with your replacement