Congratulations! It sounds as though you have pulled off a real coup. I think that all the IRS requires is that the vehicle is certified by the manufacturer. Keep checking the IRS site for updates. You'll have until April 15th of next year (or October, if you file for an extension) to get Ford to certify the 2005 FEH for the credit.

I wouldn't brag about it to the dealer, if I were you.