I'm in the same boat; do you have a link or know what size that were used on the larger holes?Were you able to find the zip ties with the push-in trees for the larger holes on each side? I was able to find some for the smaller holes but the larger ones are like 1/2" and my push-in style ones are only made for 1/4" hole sizes. Currently both ends of my lights aren't completely flat against the wall due to not having found a solution for the 4 larger holes. Any tips are much appreciated & your install looks great!
Mine didn't stick well to the Ford spray-in bedliner. The only "droop" I have is where the large holes are.