Ford 2003 Mustang Workshop Manual page 1194

9. Install the crankshaft sprocket, making sure the flange faces forward.
10. Install the timing chain guide.
1. Position the LH timing chain guide.
2. Install and tighten the LH bolts.
3. Position the RH timing chain guide.
4. Install and tighten the RH bolts.
11. Install the timing chains.
Install the LH (inner) timing chain on the crankshaft sprocket, aligning the copper link with
the dot on the crankshaft sprocket.
Install the LH (inner) timing chain on the camshaft sprocket, aligning the copper link with
the dot on the camshaft sprocket.
Install the RH (outer) timing chain on the crankshaft sprocket, aligning the copper link
with the dot on the crankshaft sprocket.
Install the RH (outer) timing chain on the camshaft sprocket, aligning the copper link with
the dot on the camshaft sprocket.