1957 Evinrude or Johnson are one year only with a 5 pin connector and had a push button to start. The following year they went to a 7 pin connector with a key start.
As Frank said nymarine has reproduction harness components.
They occasionally show up on Ebay or at outboard meets. There is someone who specializes in the restoration of 1957, 1958-60 OMC junction boxes. (Message me and I will give you his info)
Others bypass the control box and mount the solenoid under the cowl and rewire the system.
