Just wanted to give a heads up that if you are adding this light to a '67 cab the distance measured off the bottom of the channel to the top edge of the cut out is not the 17 1/8" as mentioned. The measurement for a '67 cab would be around 15 1/2" and that places it roughly on center between the top edge of the cab roof and the top edge of the rear window weatherstrip. You can move the light a little higher or lower to your liking but we chose 15 1/2". If I was to use the 17 1/8" measurement on my cab it would have put the light way too high near the top of the cab roof.
