They look like drip rails to divert water off the slide. You would need to remove them and add the awning rail in that location. I looked at installing the toppers myself but it is at a min a 2 person job standing on ladders. It is worth the money to have them installed.
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RipinSC
2019 Eagle FW 321RSTS
2015 GMC 2500 HD 6.0 Gas
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