I just got done replacing the radiator in my 900 S, and viewing online this is a more than frequent problem. So much so, people are making their own protection.
It was pretty obvious when I investigate my problem the “backside” of the radiator is exposed and the electric fan is the culprit, as it catches the gravel and then grinds it into the radiator when it is triggered.
I hope they come up with a solution. I hate to “mickeymouse” anything.
Fort Mohave AZ