Great for replacement or upgrade on most standard office chair, stool, and task chair arms. Sold as a pair (Set of 2) Universal – left or right are the same. Arm Pad size: 4″ Wide x 10″ Long, Mounting screw holes distance is 4″ (100mm) apart Mounting Screws hardware included: M6x14x4pcs; M6x20x4pcs; and 1x wrench Better compatibility. Widder Cut-out area for mounting: 5.9″ x 2″ (150mm x 52 mm) Sold as a pair – Set of 2; left and right side are different: 1. Mounting screw holes distance 4″ must exactly Fit yours, otherwise, not workable for you. 2. Your arm support frame interface shall be smaller than my am pad slot ( Cut-out area) size 2″ x 5.9″ , so that my slot can hold your arm support frame interface. If width or length of your arm support frame interface bigger than my slot size, then not fit.