Ford 2003 Mustang Workshop Manual page 2562

28. NOTE: The alignment pin is a fabricated M8 x 1.25 mm (0.05 in) bolt with the head removed.
Install an alignment pin at the top of the case.
29. NOTE: Make sure the gasket is positioned correctly and the case passages are not covered.
Install the pump gasket.
30. NOTE: To aid assembly, shake the input shaft while pushing down on the pump.
Install the pump assembly.
31. Remove the alignment pin and install the front pump bolts.
Alternate bolt tightening to set the pump.