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I have leftover 3M black-out tape (the good stuff) for the belt line. Plenty enough to do 1 car's beltline. $13 shipped!
From Pete at Minspeed... http://www.minspeed.net/BOT.htm
Keep in mind that the beltline of 07s is slightly wider than Gen I. Don't know width of tape for sale. I used a 60 cent roll of vinyl tape to do mine. Works great.