These mounts clip right onto the crossbar on the inside of the body of the TRX-4M Defender. I've included a file for the mudflaps as well but I just bought a $1 black binder and cut that to size. You could print out the mudflap and use that as a template.
The mount and mudflap have holes that should fit the tiny screws that come with the lighting kit, however I just used CA glue and the binder material took it very well and it's a very secure connection. Make sure to attach the mudflap to the correct side of the mount - you'll know because it's slightly angled.
You will need to leave a tiny bit of space between the clip and the side of the body to clear some of the bodywork. My process to install them was to push them up sideways from the bottom and rotate them into place.
Print as oriented, with supports.
Happy crawling!
The author marked this model as their own original creation.