I have a Mk 3 and power unit for sale right now, comes with the dog bone.
It worked about 5 years ago until the older fellow sold it as he was moving into a much smaller place and had no room for it. I bought it for the wash board base. It has been sitting in my basement for about 3 years now.
I also have other 19 set parts.
If anyone is interested email me at
northman@rogers.com
Dean
Ajax Ontario