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I bought these bed rails a couple years ago and they wouldn't work with the cover I had on my bed. They have been in the box ever since.
They are Putco #88822 Locker Side Rails (black) Fits 1973-1996, 1999-up SD Ford short bed. (Picture is from putcos web site)
Paid over 200 for them!
New (get them out of my face) price = $50.00 plus shipping of course