And you can not tell them apart by looking at them on a car. There may be bracing differences underneath but I was not aware of that.
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Pierre
69 2002 (M20), 74 tii, 74 2002, 76 530i (3.3), 79 323i, 89 325iA 4-door, 91 318is, 96 318ti (S52 project) 97 M3 4-door (wife)
http://home.roadrunner.com/~pchamaa/kamei_repro_spoiler.htm
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