Well, here I am! The standard Sydmeko arm rest fits perfectly between the seats. It's the best and (I.M.H.O.), the only type worth fitting. It is attached to the drivers seat and there is already a mounting hole in the seat frame, ready for it. It does, of course, move with the seat and lifts for access to the hand-brake. There IS a Sydmeko version which consists of TWO separate arm rests which mount to each seat. However, they are thin and spindly and conflict with each other depending on the relative seat position. Purchase the single type.
David