Yesterday I also ordered the official Ford shop manuals from the Helm Corporation:

1 of 3R3J19G219AB: 2003 Ford Mustang Owner Manual Portfolio @ $40.00 each
1 of 3R3J19A321AE: 2003 Mustang Owner Manual @ $0.00 each
1 of AW7J19A342AA: FORD PORTFOLIO @ $0.00 each
1 of FCS1212103: 2003 Mustang Wiring Diagram Manual @ $79.00 each
1 of FCS1219303: 2003 Ford Mustang Workshop Manual @ $180.00 each
1 of 3W7J19T200AD: 2003 Ford Service Maintenance Guide @ $10.00 each
1 of 3W7J19T201AE: 2003 Ford Warranty @ $10.00 each

The main items I was after were the wiring diagram & complete workshop manual - but then I noticed I could get some of the 'original paperwork' (Portfolio & Owner’s Manual) so I added that stuff on just for the hell of it.

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Curent 2003 Ford Mustang Mach 1 owner - Build Thread for her: Logan's 2003 Mach 1

Former 2003 Ford Ranger owner - Build Thread for her: Project Budget Buster