I did the second liner today with the same end cuts as pictured above and finally figured out exactly what they need. The outer edge that goes between the fender and the fender flare is left uneven and too long. I used a belt sander and shaved it down to 1-1/8” except for the ends where it needs to taper near the screw holes. When I have time I will remove them and sand that edge down to 1 inch. On the other side I cleaned it up some, but didn’t realize that dimension is somewhat critical for a good fit, so the liners aren’t as flush with the outside of the inner fender area as the second attempt. Once they are trimmed the install isn’t bad. Another tip on the install, don’t fully remove the factory flare screws across the top, that will keep their speed nuts from being pushed out of place when forcing the plastic in there. I used a plastic wedge to pull out the flare and get the lip slid in. I skipped the second screw on the inside that requires drilling, they are plenty solid without it.
Also, these will be very easy to trim for bump stops when the time comes. The pocket in the back is almost a perfect template. One could probably bolt a piece of metal or even a carpenters square to the two holes as a cutting guide.