I removed my headlight when I installed the headlight guard; I had a good look at it and despite the 4 screws it looked quite sealed so I will be interested to see if he was successful. $1800.00, I wish. Here in Canada I was quoted $2400.00 CDN for a replacement headlight hence the now installed guard.
After seeing the price of that headlight I almost immediately installed a Tourtech headlight guard on the GS.
My RT also took a stone and cracked the headlight, That too only comes as a unit, at $950, it's cheaper...but. We now protect these items from flying rocks.