Regarding BMC kit install being older than dirt and liking a lot of room to work - recommended first step
Put truck up on jack stands, remove front wheels, and make sure you use a 3 ton or better jack

It was easy to remove fog lights their brackets and then installing the BMC brackets by having complete access to inner fender area not having to work around the front wheels and tires
View attachment 243790
Didn't experience issues that
@SoFloTremor had. The brackets fit along with the "rubber baby bumpers" provided, guessing I was lucky.

The most annoying/time consuming part of install was adjusting the brackets and lights getting level alignment and correct fore/aft spacing
Used the OEM fog light harness to connect to S2's - BMC has a pig tail kit making this easy peasy
Squadron Pro wiring followed the path of the OEM fog light harness zip tying as necessary up to Upfitter Switch #2