Sorry for long the read but on a previous boat I made my own steering arm with some 1/2" threaded rod, 2 air compression fittings sets, 2 ball joint type fittings, 2 nuts and a piece of pex plastic water pipe. Took the threaded rod, cut it to a required length between engines when engines were in the drive position. Slid a piece of pex plastic pipe over it to cover threads before installing the ball joints on each end of the threaded rod. Ball joints purchased off Amazon. Fasten other end of the ball joints to the female halves of the air compression fittings. Use 2 - 2" pieces of threaded rod to screw to the 2 male halves of the air compression fittings. Install a nut on the other end of the 2 -2" pieces of threaded rod. Had to have a local welding shop weld the nuts onto 2 steel plates 1/4" thick approx. 3" x 4". Drilled holes into the plates so it could be attached to the fin just above the prop on the main engine out drive and the kicker motor. Used the air compression fittings so I could remove the bar between engines if I needed to. Used the ball joint to have the flexibility when engines were raised and lowered. Painted all metal with some black trem clad paint. Use lok-tite on all thread connections. Air fittings and ball joints had 1/2" male or female threaded ends as required. Actually worked really well. Cost me about $50.00 for materials and welding.