Wow, yeah, that's a horrible fit. WKOR fit snug under the rocker. I adjusted mine for 3/4" of clearance under the seam front to rear. Seemed pretty easy to adjust the gap based on U bolt tension.@nigelsiam @Fj80oregon Hate to pile it on but I'll share mine as well, purchased November of last year, because I wish I had read these comments before I pulled the trigger. Like @SNLC said, pretty disappointed at this point after spending the money on them and thinking I was paying once to get it right the first time.
@Tuite did you happen to have any more pictures as you were modifying it? Looks like the legs are just an inch or so too long. These were the OPOR sliders, installing was okay for me, one u bolt had to attach at a slight angle and the front driver plate against the frame actually make contact with the floorboards of the rig, had to clearance it by maybe 1/4 inch. That could just be due to original body mounts.
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Did you order those long so they'd function as a step? Not trying to be funny - just can't think of another reason to build sliders like that.