"Rad Parts" appears to be a legitimate business that sells high-quality UTV accessories. They offer a wide range of products, including wheels, tires, exhaust systems, clutches, and more. Customer reviews on Amazon for one of their products, the "RAD Parts Extended Length Wheel Studs W/OEM Style Tapered Lug Nuts", are generally positive. The average star rating for Rad Parts on Amazon is 4.5, which indicates that customers are generally satisfied with their purchases. However, as with any online purchase, it's always a good idea to do your own research and read reviews before making a decision.