This is Agency Power AP-PROXP-810-BLK Rear Mud Flap Trailing Arm Guard Black Polaris RZR ProXP | ProR | TurboR 2022+. Manufactured by Agency Power.
The one downside to running a Polaris RZR in 4x4 is the excessive amount of rocks and dirt that gets kicked back onto the machine from the front tires. It is common for dirt, mud, and rocks to get into the rear brakes and cause some serious problems. Your rotors will get eaten up, the pads won't last, and you could end up having to replace your wheel bearings much sooner than expected.developed a mud flap kit to protect your rear brakes, trailing arms and wheel bearings. The mudflap kit is a simple, yet sturdy, design that is easy to install. Installation takes a matter of minutes and you can enjoy your protected rear without the possibility of debris getting caught in them. A 3/8th thick 10"x14" flap was used for maximum coverage and protection.The laser-cut mounting plate offers rigid mounting while also providing a touch of style. Mounting the mud flaps is very simple using the existing mounting points. The factory hardware can be used and no modification is required for installation.