If you're talking about the 2000 Cobra R wing then yeah, I think it might be a little ricey. I think those wings only belong on 99 & up stangs, but if you like it do it. Just make sure it has the power to back it up.
Ive seen pics of them on SN95 body style cars and it dident look very good, I think it would look even worse on a fox. They just dont look right unless its on a 99+ car. But its your car do as you please w/ it.