Fitting our standard system, the "K4" footrest has nine-inch rails, which allows you to take advantage of the shortest footrest position with confidence. The rails overhang the side plates (behind the fixing point) by an additional two inches, which give the system extra stability. Bear in mind this footrest fouls the tiller crossbar at long leg positions.
Please note, there is no angle adjustment with these footrests. K4 footrest pictured below.