Sorry for your trouble; I've thought about that happening as well. My brother did the trick with driving in the garage with a bike on a roof rack too. The noise was bad, but the damage to the bike, garage and car... Yikes.

I'd call around to some local auto glass shops to see what their price is, and if it's close in price to that trunk lid in the Chicago CL ad, I'd go that direction. Painting the steel to match yours shouldn't be too bad.

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2001 X5 Sport 3.0/5-speed
1998 318ti/5-speed
1988 735i/5-speed
1984 528e/5-speed (soon to be M20B25-powered 525i!)