The "low friction" ball joints started in 1985.

http://www.bentleypublishers.com/gal...&galleryId=163

"Starting in the 1985 model year, Teflon-coated, low-friction ball joints were fitted in the GT and 5-liter LX standard Handling suspension system control arms and remained in Fox Mustang production through 1993. Designed to reduce bump impact harshness, these late joints can be identified by a distinctive lack of the grease fitting found on earlier, all-steel ball joints."

The Ford catalog is wrong. 94-04 control arms are the same except 03-04 have a little more clearance for the larger 275 tires.