Ford 2003 Mustang Workshop Manual page 2787

22. Remove the fifth gear synchronizer blocking ring.
Inspect the blocking ring for wear or damage. Install new blocking rings as necessary.
23. Remove the fifth gear synchronizer sleeve from the synchronizer hub.
24. Remove the synchronizer inserts and the springs.
25. Remove the needle bearings and the thrust washer.
The fifth gear needle bearing is three separate pieces: bearing, spacer, bearing