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The first thing you need to determine is what type of front end it is. My 92 EM uses a typical Mustang II set up. E-M use to offer Corvette suspensions as an option. Before you can figure out the ball joint you need to know Ford or Chevy. My manual is no help for part numbers. What I've done for almost every part I've needed is to take it to a good parts store and throw it on the counter. I've got a couple of Wizards here in VT that I haven't been able to stump yet. If you know the ball joint is bad, take some pictures of the control arm set up , Remove the ball joint and head to your local NAPA or PEP Boy's or whoever you use for parts. Good luck.

Tim