Hi Matt,
There are a number of vendors you can locate just pumping “Wayfarer Outboard Bracket” into Google, but the one on my boat looks like this one:
http://www.boatsnbits.co.uk/acatalog/Cruising_Specific.html
Not cheap but is very good and makes installation and removal easy, even at sea. Then again, I know a very seasoned Wayfarer sailer who makes do with ply pads he uses when we needs to use the motor and can then remove them when he doesn’t.
I guess it depends on whether you are an out and out racer, in which case every ounce of unwanted weight is too much so bolting a bracket to the back of your boat would be unthinkable!
Tony