I finally found your Mustang! Sorry for the delay but my last excursion to Walmart was a bust as they hadn't restocked and only had some generic hot rods and coupes. Decided to stop by today and lo and behold, the only Boss 302 was sitting on the shelf just waiting to grabbed.
If you're still interested in an exchange, my email is wrivera343@gmail.com. Just send me a message so we can exchange shipping info and all that.