Ford 2003 Mustang Workshop Manual page 1771

51. Remove the RH and the LH timing chains and crankshaft sprocket.
52. Remove the RH and LH timing chain guides.
53. Remove the RH and LH cylinder heads.
54. Remove the oil filter adapter.
1. Remove the oil filter.
2. Remove the bolts.
3. Remove the oil filter adapter.
4. Remove the gasket.