Nice looking GS Im up in Canada and I just received a Wes Cooley fairing from National Fiberglass Dude fabricated it for me right away and shipped it up a great fellow to deal with Im going to install mine right away as my bike is back from the shop ( 82 GS 1100 EZ) If you have time could you post some pictures of the front face as im not sure of depth for headlight I have some fairing mounts from a GS 1150 im going to try to mod THX (for anybody interested Dude makes these in 7 1/2 and 8 1/2 headlight openings for GS 1100,s and GS 1000,s)
I bought mine from Dude and in my opinion it is very high quality stuff, I love the way it turned out.
It's funny you asked about the depth for the headlight, I had the exact same question and unfortunately I never received an answer so I came up with an idea of how to do it and this is what I decided on
I cut a spacer out of sheet aluminum, off the top of my head I think I used 1/8" thick, this is also the one thing that I would change, instead of making this spacer the thickness I did I would make it 1/4" instead. It seems like 1/8" is a bit of spacing but in reality it's not that much when you consider that you will still need room for adjustment of the headlight.
Here is a link to my photo albums in it I've got one labeled Fairing Installation, it's got all kinds of pictures that you might find helpful.
http://www.thegsresources.com/_forum/album.php?u=14086
As for the spacer I measured the actual diameter of the headlight bulb itself and then made a border around it like 1/2" then cut it out which you can see above.
I ordered the actual Wes Cooley brackets that are still available from any of the parts distributors that fit the '79-'80 GS1000S. What I noticed was that the lower brackets had all the correct angles but they dropped down too far so I had to figure out a way to shorten them, the ones in the photo above are the ones I made, they're pretty much exactly like the originals except shorter. The top brackets are the ones that I ordered but of course the yaw angle was wrong so I cut the weld, repositioned the cross bracket and clamped with a pair of vise grips then had them welded in place.
The windscreen is another story.
These are the original brackets:
These are the new brackets after the lowers were remanufactured and uppers were reworked:
Original lower tracing to make shorter, I placed a thick book on the floor and used a blank piece of printer paper, both sides were traced individually:
New aluminum angle brackets to be made into lowers aligned on my pattern:
Old and new together:
Upper with mount pad removed:
This is how I clamped it for the correct angle for welding:
Fit check before painting:
The end result, there was a lot more that got it to this point and changes that were made to the upper mount brackets:
I know this is quite a bit of an explanation but I have a habit of getting wordy sometimes, besides I love pictures.
By the way post a picture of your bike so we know what you're working with.