Do you need a new exhaust, too? 'Cause I have my stock exhaust sitting in the garage that I'm dying to get rid of. I'll take $20 for it.
Only kidding, but I think you'll probably need to go through the dealer if what you want is another V6 bumper. I'd take the opportunity and go for something else, though, unless you like that bumper.
Basically, if you're going OEM, you always get screwed. So unless you really, really love your OEM V6 bumper, take this opportunity to upgrade your Pony.
You could probably get an entire GT appearance package (front bumper, rear bumper, side skirts) pre-painted from newtakeoff.com than you could get an OEM rear bumper purchased and painted from Ford. Or spend a little more and get something more unique and aftermarket.
Anything breaks on my Mustang = Great excuse to spend some cash on an upgrade.
Thanks for the suggestion guys, I think that I'll get the GT bumper + FRPP dual exhaust instead of the v6 bumper. Plus, I'm going to have to re-stripe it. Is striping hard?