You can't use it period. The foxes and 94/95 cars use a clockwise rotation blower. 96+ is counterclockwise. Also the mounting brackets are completely different, not even close.
Sad to be the bearer of bad news. Good thing is if you truly got that good of a deal on it you can sell it and make a profit. They generally sell for $1500 or so with a low mileage headunit with no shaft play.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.