Re: older 5.5hp johnson seahorse steering
There was an adapter kit for those motors so you could use a regular Simplex or Ship Master control and steering. What year or model is it, I will see if I can find a picture. There weren't a ton of them made, so it may be a bit difficlut finding one, unless you get lucky.
EDIT: I looked through my stuff and can't find a picture. But the kit consists of an adapter piece that bolts to the shroud and the shifter control cable lock goes on it. And a extended front carrying handle that bolts on. The steering attachment connects to the extended handle. The throttle control cable lock is a standard part/installation.