I believe those are the type I used in the stake pockets of my 2001 2500 HD. Might not fit our twins but worked great in the FS.
The earlier pictures were for the ones that mounted in the bed and not the style that PieceKeepr posted here. I think that this stake pocket style would fit in the front pockets by the cab after the plastic is cut away. As PieceKeepr stated, there is nothing to state whether they will work on the odd shaped pockets by the tailgate. They may work, but no guarantees.Buy Bullring Classic Retractable Tie Downs - designed to fit many Chevy, GMC, Dodge, and Ford trucks. Call for questions about fit 888-879-2855.www.bullringusa.com
I didn't see anywhere in the manual where it specifically says what you can or can't do. I didn't find anything on the Upfitters site either , but I didn't really know where to look.
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I went back to the owners manual and didn't see anything about not being able to use the bedrails. I apologize for the bad info. I could have sworn I read that somewhere but did not see it myself today when I went looking, and as @PieceKeepr shows it does not mention that in the manual.I actually think I remember reading somewhere they specifically say you cannot put anchors on the rails. Might have been in the owners manual.