Just do what I did, grab a piece of cardboard, and trace out a design for the shroud that you like. Cut it out, and hold it to the tank with the tank mounted, and turn the handlebar, to make sure it has enough clearance, if not, trim it a little at a time. Then for the other shroud, I just flipped the first one I cut around, and traced it, so it would be the same, only opposite. I cut mine out of aluminum sheet with a sheers, and a band saw to get the tight angles. They are nothing fancy, and just flat, not profiled, but they fit nicely, and give it a one off look, at least to me. I say go for it, I think it will look cool! Here are the only pics I have, wish I had a couple better ones.

THE 80's RAGE! Currently owns:
81, 85 Yamaha Tri Moto 125
83 Yamaha Tri Moto 200 x2
82,83 Yamaha Tri Moto 175 project
85 Yamaha Tri Z 250
84 Kawasaki Tecate 250
84 Honda ATC 70
85 Honda ATC 350X
84 Honda ATC 250R
(2) 84 Honda ATC 200x
82, 83 Honda ATC 185s
81 ATC 200
Lots of other parts and bikes