Need wiring harness for 1972 25hp johnson

[fbcoach9534]

I am looking for information on where I can buy a wiring harness for my 1972 25hp johnson outboard. I am looking for the outside harness not the engine harness. The end of this harness is kind of square not round. If anyone can help me or knows where I may check on the web please respond or email me at ballcoach9534@yahoo.com

Thanks