00mustang95,
97-2004 did have use the same Radiator support. We've test the exact same support on all of those years Mustangs with no problem at all! 94-96 are the only year it doesn't fit because the Radiator clips we're much smaller and wouldn't clip in. You won't have any fitment issues at all putting our radiator support on your 2000. The body style is a different but behind the bumper is the same!
I hope this helps, let me know if you have any questions! Our Mustang Experts are here Monday-Friday from 9AM-9PM EST and Saturdays from 9AM-5:30PM EST. If you want to hit them up, their number is 866.727.1266.
-Dan