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Agree with Lee, not sure what price but if you do a google search there are heaps of people ho sell them, DR Motorsport spring to mind and they colour code them, BTW that felt on the roof of that shed is in need of some sorting!
looks like the dr motorsport one which is £350 painted new. given that your market would be a lot less cos you're counting on someone with a silver car (probably of similar age) wanting it, and the fact that it's presumably already drilled... i would suggest 200-250ish to start with, depending on condition (and how quickly you want it gone).
id be inclined to put it on ebay tho as u may get a lot more.