@Smitdog The Rack 88 installation videos shows two options that might work, if it does not fit as is...
1. The Ford Adaptor Bracket:
2. The Hanger Cross bar:
Based on your pics, I think there is a chance it would fit "As is."
How is your Ride88 Bracket secured to the bed? Is it pressure mounted on the sides? If so you might mount it an inch away for the inside of the bed to offer more clearance if required.
Just installed my Black Armour Bed Liner, its a bit heavy and "dead weight" but pretty easy to install, very similar to the install video, but I aligned mine and rolled it out. This thing is thick, and smells of tires (as does my truck), after about 3 days the smell has diminished greatly and...