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I can tell you that the reinforcement in the doors adds 10lbs per door. I'm not sure that the bumper reinforcement stuff weights quite that much, based on a rough estimate of the square inches of metal, and the weight per square inch based on the thickness of the metal. I'd guess more like 15-20lbs per end. Could be wrong. Other areas of the chassis where early 280Zs have extra weight are the front frame rails, which, IIRC, have a reinforcement on the inside, the lower rad support, the rear strut towers, subframes under the floor, lower rear quarters, various bracketry, and likely a handful of places where you can't see that something's been added. Later 280Zs have even more reinforcement, notably in the door jamb area, and the spare tire well/gas tank area. John C has a few posts on the differences, and I believe he mentioned some additional metal in the roof structure as well, although I'm not sure if that was all 280Zs or just later ones. The series one shells do use thinner metal, I checked a few areas with a micrometer, and compared between my early '71 and '76 280z, as well as a few pieces from a '72 240z. the early '71 sheet metal came in around 0.9mm, whereas the later sheet metal came in slightly thicker at about 1mm. I believe (I'd have to look it up to be sure) that John C has also said that the early 240Zs and later 280Zs are 300lbs difference, and the late 240Zs and early 280Zs are 100lbs difference.