Randyb404, I just installed the same mud flaps on my 2023 Corsair GT that Sharbotcom recommended (thanks for that recommendation Sharbotcom). For my install no trimming whatsoever was needed. It fit perfectly around the rocker panels. Maybe they modified them for this year???
I took out the black plastic retaining clips (center piece) by carefully placing a small flathead screwdriver in the notch in the collar and working it out, they were easy. Then, I carefully removed the collar too. After matching the proper flap to the wheel (they're labeled) I pushed in the collar, then the clip. All went great
except for two areas on the front flaps. The 1st area that didn't work well was there is a section where you slide the supplied black clip between the indents of the front flap and clip it to the wheel well. That would have worked fine except Lincoln has a support piece that doesn't allow you to push the black clip all the way home. I was concerned that the clip would work its way out so instead I used one of the supplied scews and the silver retaining clip that was provided. The second area needing attention was that for more support I also drilled an extra screw and retainer from the bottom of the flap into the rocker panel. Their entire rocker panel is now attached more solidly than Lincoln originally did in their manufacturing process! For the rear flaps I again removed and reused all the plastic retainers from Lincoln and again drilled a mud flap supplied screw and retainer into the bottom of the flap into the rocker panel. I mostly did this extra support because I live in a snow area and assume the flap will get extra heavy with snow accumulation. Be aware, one rear flap (I think it was the left rear) does not need to be anchored into the rocker panel as there is a screw you need to remove from the panel and reuse that to secure that flap to the rocker panel. It should be evident when you see the configuration. On this flap I made the mistake of securing all all the plastic clips and when I physically moved to screw the bottom of the flap, just like I did the other 3, I saw that there was the bolt to remove and secure the flap to the rocker. I had to again remove the clips from Lincoln and start all over.
Hopefully this is clear. It's like trying to write someone on how to tie a shoe lace. Better visual than written

. Any questions, ask away & Good Luck!
P.S. I don't like the material Lincoln used for the wheel wells. It's like a cheap felt-like material and very flimsy. I notice it's not very secure in certain areas either. I like things to be solidly installed and these are far from that. Not very confident this material will hold up well with our Winters.