I am currently in the process of doing exactly the same thing as you are describing. I have a 2wd truck and I am in the process of putting on a 4wd bumper w-foglights. As far as I can tell now it is going to be pretty easy except there are alot of parts involved.
Bumper (face bar) F65Z 17757 CA
Bumper pad F65Z 17K833 AAJ (WHITE)
Valance Panel F65Z 17A385 BA
Mounting Brace R F65Z 17752 BA
L F65Z 17752 DA
Mounting Plate F65Z 17B984-5 BA (2 Req)
Stud Plate F65Z 17C886 AA (2 Req)
Tow Hook F85Z 17N808 CA (2 Req)
Fog Light Kit F65Z 15200 ABA
These are the part #s for this if you want everything. I haven't yet determined if you need it all or if any of the parts are interchangable with the 2wd. Maybe some of you folks will know.
1998 F-150 SC Flareside 4.6 Wht/Grey Auto
Additions: Line-X 8-31-99
3.73:1 Pro Auburn, Custom made cold air induction system, Flowmaster exhaust, N2O (when needed)
Epic Lakota Chrome wheels and 285-75-16 tires.