Walter, as far as the TSB goes, yes you can check it yourself. This covers 2005-2009 Mustangs and 2007-2010 Shelby GT 500's built on or before 8/3/2009.
Symptoms: grunt/creak noise over bumps, rough roads, driveway approaches.
Diagnosis:Use chassis ears on lower control arm hydro bushing bracket tabs to verify noise is coming from hydro bushing.
The replacement ball joints are 19mm. (0.75") and have an improved hydro bushing. If your car has 18mm. (0.71") ball joint shafts, you have the old ones. You can use a caliper to check.
I can post part numbers,etc..., but it best to print out the TSB and take with you to the dealership to ease their reluctance/stupidity over these matters. This TSB is mainly for noise, but I think they realize there is a ball joint problem; why else would they increase the size? Trying to get out of a recall? Hope this helps some of you.