Anyone know the offset of a 2004 F150 Lariat factory 18" wheel?

 

... is your friend.

Quoting FoMoCoFoMe -- "While there are many different tires speced for the new F-150, Ford only has one wheel width for all their OEM rims: 7.5". Same applies for the offset at 44mm and max wheel load capacity at 2,100 lbs (except for the 7 lug steel wheels on the HD Package equipped trucks)."

BACK GROUND INFO:
http://www.rsracing.com/tech-wheel.html
http://www.mickeythompsontires.com/t...ckspacing.html
http://www.usacomp.com/Offset.htm
http://toy4two.home.mindspring.com/offset.html

Some thread links:
https://www.f150online.com/forums/sh...ghlight=offset (read all the way to the bottom)
https://www.f150online.com/forums/sh...ghlight=offset
https://www.f150online.com/forums/sh...hreadid=149938