If you can't find the plastic ones you are looking for. Like Panther said you can get a metal one. I would look for a brass piano hinge. If you get a metal one, brass or aluminum is what you need, Anything else will rust.
I don't know how you would bolt them to a glass hood, then again I may be unfamiliar with the kind of hood you are using. I would just silicone it to the glass. It should hold and if done with care not to use too much (to avoid excess) it shouldn't look to bad.