Fractal Design Define R4/XL R2 USB Port Assemly Supplies Fractal Design Define R4/XL R2 USB Port Assemly Pictures × Previous Next Model: Fractal Design FD-SPARE-DEF-R4-USB-KITThis is a set of replacement front USB 2.0 and 3.0 ports for the Fractal Define R4 and Define XL chassis.