Fender tag info for code E2X9 on 1973 Dart Swinger

Hi All,
I have been able to decode all my fender tag codes except this one...E2X9...for my 73 Dart Swinger. Checked some Mopar sites but unable to find this build code. I'm sure someone will know it. Taking the Dart to it's first car show (with me) at Virginia Int'l Raceway in Alton,VA August 9-10 (Virginia Tech Day) and just want all fender tag info to be correct.
Thanks Greg