I didnít use your link , just went to there website,
And it wasnít listed, did a search on there website and all that was listed for a GL 1800
Was national cycle, and as far as opening vent,
I ride with vent open all the time.
you don't say which website?
if you meant www.madstad.com
you have to enter your bike info, make, model, year, etc....
stick with CycleMax as I provided.
no way to miss it.
IF, you want air in your face, Madstad can do that for you instantly.
if you don't want air in your face, you just change the tilt, or raise the screen.
it is the most advanced screen on the market.
it can satisfy every one.
I do NOT miss that vent, the vent is useless for me, can't even feel the air from it, because I am ATGATT with heavy touring mesh jacket, touring pants, gloves, Shoei helmet. IF, I want air, I change the screen and get all the air I want.