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I doubt newtake off would have any GT500 parts, but your best bet is to either find a wrecked car or do some searches on here as there are several threads with lists of needed p/n's. After which you can price shop the list at dealers. Tousley Ford in MN is usually one of the cheapest places for parts, but the shipping on the front fascia might kill the savings.
If I remember correctly, think the front end conversion usually runs about $1,600 before paint.
Local Ford dealer is your best bet. Tousley Ford gets a lot of hype but I got mine cheaper local. BUT do price shop the dealers, each dealer can set their own price...