[Christ]

There are a set of CRX wheels, they're magnesium, 13x5 I believe, and are mostly aero, except 4 slots placed symmetrically around them. I have a set of them, and I believe they're about 8-10 lbs a piece... I put them on my old race car, and it made a dramatic difference from the steel 13's I had.

The 1986 CRX Si came with 14" alloy wheels, they looked like buttons, even though they were commonly referred to as "phonedials". They were also pretty light.

If you're into aftermarket, and you want to run 15's, you can get a set of Motegi TrakLite rims, or TrakLite 2.0's... both are under 13 lbs per wheel, but they're not aero at all. They chop through air like a helichopper rotor would. There is no point in getting those if you're just going to cover them with something to make them aero, so in all honesty, google "phone dial rims" and look at those pics... those are probably something you want... there are only 4 tapered holes, symmetrically placed with a 2-sided bias, and they're still really light, as mentioned before.

As far as filling window gaps, or sealing windows/headlights, get 3M Windo-Weld. It's black silicone based goop that some places use to install windshields. I personally use it (along with many other people) to fill the gaps in motor mounts to stiffen them up. (We're cheap). Although I've also used it to seal windows and Lexan panels, and fill in seams in vehicle sheet metal.