Didn't need to. As long as its wedged in there good it's not budging one mm.

I actually used glass cleaner as a lubricant and had to use a small putty knife to "pry it" into the channel and so it locked in place, at first it was only kinda half way in there but once I went over the strip in the groove a couple times to wedge it in all the way, its perfect now. Shouldn't need any silicone, if you used some you might not have it in there all the way.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards