mine is a 69 it doesnt look like that one.mine bolts to the side of the motor next to the right of the carborator.and i dont have nothing because the person that had it before me took it off and lost everything.
I haven't seen one for a 20HP, but I will keep looking. You can also place a free classified "wanted" ad on www.aomci.org looking for a 1969 Chrysler 20HP recoil (word it that way). I bet someone will have one for you.