I took my plastic off. I think it looks better and the plastic was rubbing the paint off the fenders.
My sissybar is a 17" Cobra. They gave me an assortment of bolts, so I had the option to take off the plastic or leave it on. I left them on until I got the Easy Brackets for my bags, when I noticed the paint was being rubber off by the plastic chrome.
The plastic trim remain with the side rails of the sissy bar fitting over them. That said, the kit should be supplied with longer bolts. If they didn't include them, just take the existing ones to a hardware store and buy ones 1/2" longer. I've never seen them w/o the plastic trim pieces mounted, and based on what a Kawi sissy bar looks like, there would a big weird gap between the fender and the side rails, IMHO.
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