These are body clip adapters to fit a TRX4M Bronco (2021) body from your favorite litigious RC manufacturer that starts with "T", to replace the overplayed Power Wagon body on the otherwise brilliant Furitek FX118.
These do still require some slight modification, but when you're done you'll have a TRX4M body with no visible modifications and an intact FX118 chassis.
You'll need to clip the mount for the fender flares under the hood, and trim back the clear posts slightly, so the upper part of the FX118 frame clears it.
To mount them, I simply removed the body clip post mounts and the front/rear braces from the frame, then mounted these clips in place of the braces. You may want to chase the holes with a drill bit prior to putting the screws in.