The instructions say JK/FJ. Maybe it is a universal mount that works on several vehicles. Since the FJ was out before the JL, they may have it as an FJ part number. Will it even work?
Unfortunately no. The angles are all off and the holes do not line up. Believe me I would rather have a horizontal mount since I could carry a larger jack. There is not a horizontal version for the jl only the vertical one that I ordered. Besides no Jeep owner would install a part that advertises the FJ symbol.