Fiber glass body panels

How much weight difference is there between the glass panels and the metal panels. I was looking at the cost of the panels from glasstek and just wondering if the weight savings would be worth the cost and extra work.

http://www.bigblockdart.com/techpages/weight.shtml

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http://www.bigblockdart.com/techpages/weight.shtml

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Thank you very much.