Cab Clearance Lights

[68panelman]

There are threads on this topic, look up in the search area. I hope you got the correct Yankee 77 cab lights, They look the best, besides the factory fireman in 69 -72. One of those threads has the measurements for drilling and mounting, and harness routing. I'm almost certain there is a 6" on center rule stated by dot at the time. I've seen a lot of pictures of these trucks with cab lights on them not measured out properly and they look like real crap. Take your time do it right.