Welcome,
What Bob said is true, the Mustang Assembly Manuals are helpful, even though they are about 90-95 percent accurate. The differences are plant related and running changes that Ford made in the assembly line. Other reference sources are the AMK Guide to For Fasteners, and the AMK catalog itself. However, Shelbys are very specialized and occasionally inconsistent as they were built by Ford, but adapted by others. That makes life interesting.
Jim