chocked full of excellent catalogs in pdf format:
http://www.icsarchive.org/icsarchive-org/private/Ford 1980-1989 Truck Master Parts Text/
http://www.icsarchive.org/icsarchive-org/private/Ford 1980-1989 Truck Master Parts Text/
AMEN!!!Wish I could find something like that for the OBS trucks...