front rail protector

[Rick Kline]

Hi I am a 19 GMC Canyon base with a ext cab that I installed a quad fold  cover tonno cover from the GMC accessory store.  My problem is that the front end leaks. I believe the problem is, it doesn't have a rail protector across the front like the tail gate top does, not allowing a tight enough seal. I have it adjusted down as far as I can get it and still latch. The truck has top protectors for the tail gate and side rails, but not the front end

 Do they make a protector for the top of the rail that's by the cab?

Thanks in advance