I have a 2017 Lowe pontoon boat and it won't fit my rails. They were a bit narrow being plastic so I brought a heat gun. I just warmed them up to stretch them out a bit and then they fit fine. Once they were warmed up, I could put them on the rails. After cooling, after about 2 minutes, they fit perfectly and fit my boat perfectly. So far they do exactly what they were designed for and I've had no problems. I like them, my wife likes them. No more tying bumpers, simply attach to desired side. I would give 5 stars if they fit my rails without modifications. I would recommend them if you are not afraid of a heat gun and know how to use it. I would say a hair dryer might work. It can take much longer to heat up.
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