I bought mine on ebay. 1988-1993 Engine Service Manual Supplement 7.3 Liter Diesel Engine. I also have the Haynes Diesel Engine Repair Manual that covers GM 5.7 and 6.2 liter and Ford 6.9 and 7.3 Liter, Plus the Haynes Ford Pick-ups and Bronco 1980-1991 to cover drivetrain. I would be lost without them and they are pretty dog eared oil stained and falling apart. The torque specs for 6.9 are different for some bolts like head bolts, so I need to refer to Haynes for 6.9 applications. The 7.3 manual is useful even for 6.9 due to improvements like the upgraded cam gear and valley pan. The old Haynes shows removal and replacement of the press in oil squirters using the alignment guide. Hopefully I don't need to do that as the guide is NLA.