Mine's already cracked. I can assume that somebody before me tried to open it to change a bulb.

I'm also curious how much a new one is (or whether you can get one). Also, if it's just as brittle, is that gradual from sitting in the sun, or from the type of plastic they use?

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1982 240D, sold 9/17/2008
1987 300D TurboW124.133 - 603.960, 722.317 - Smoke Silver Metallic / Medium Red (702/177), acquired 8/15/2009
262,715 and counting