I sealed the base of the lights with black GE Silicone II as the lights did not fit perfectly flush on the roof using the factory Ford measurements for the lamp locations. The measurements were taken from a truck at the dealership on the lot as well as from a friend who ordered his with the lamps installed by Ford. This will make the lamp base a semi-permanent install. The lens can be replaced with 3rd party clear or smoked flavors.

said shadowgray 2007.01.23 at 21:37:43 PST

The spacing for the cab clearance lamps on the 2004 Super Duty are as follows and measured from center to center. From the center lamp, measure 8" twards each door to the center of the next lamp. From those positions, measure twards the doors 13" to the center of the outter most lamps. Remember, these are center to center measurements. O<---13"--->O< --8"-->O<--8" -->O<---13"--- >O Good luck!

said shadowgray 2007.01.23 at 17:13:44 PST