WPeschel,
This may not answer your question exactly, but here is the best info I can offer. I have a set of the 99-02 style cab clearance lights made by Pacer ("Hi-Five" product line). As far as I have been able to tell, they are identical to the OEM lights. Anyways, the spacing between the two screw holes is 1 3/4 inches. Hope this helps.
CTD12V