Re: 68' Johnson 20hp (FD 22M)..Want to add starter..
I recently went through the same thing when trying to add electric start to my 63 18HP. I wasn't concerned with finding a part number but I wanted to find a pic of someone that had the electric start set-up so I could see what I was looking for.
Made a post on here asking for a pic and had several replies.
http://forums.iboats.com/showthread.php?t=413566
I think it may be the same bracket you guys need but not positive. I believe the solenoids are almost all interchangeable. I think your best bet is to start a new post, ask for a pic of what you need and at least you will know what you are looking for.
Turns out I found a parts motor..25hp, can't even remember what year, on my local Craigslist. Since I now knew exactly what I needed, I went to look at it and it was the right bracket and solenoid. He wanted $150 for the motor but I talked him into selling me just the starter and solenoid and brackets for $50.
Took the brackets I had off, bolted on the new ones with the starter and solenoid and now just need to wire a switch too it.