Ford 2003 Mustang Workshop Manual page 1803

35. NOTE: If necessary, adjust the camshaft sprocket slightly to obtain timing mark alignment.
Position the RH timing chain on the camshaft sprocket. Make sure the two copper-colored links
align with the camshaft sprocket timing mark.
36. As a post-check, verify correct alignment of all timing marks.
37. Position the LH and RH timing chain tensioner arms on the dowel pins. Position the timing chain
tensioner assemblies, and install the bolts.
38. Remove the retaining clips from the timing chain tensioners.