Used Technik VSTREAM screen to suit K1100LT models and if you have an electric screen on a K75RT.
These are over $200.00 new plus shipping.
This was on my bike but it fell over to the left and the left side of the screen caught on the winch post on my boat trailer. There is a gouge in it around in a L shape around 550mm x 65mm as shown in the third photo. There are few very small stone chips in it as well but other the the gouge on the left, I didn't Notice them when I was riding. The screen is around 405 mm tall. Around 50 mm taller then the standard screen from BMW.
Shipping could be high going on volume not weight as the couriers charge the highest amount. Pickup could be preferable and if you came on your bike you could fit it here.