Steve,
You might want to try Engine Masters in Bensonville Ill.
Tel # 630-860- 0610
Bensonville is in the visinity of O' Hare, I don't know where your at in Ind.
I don't know if they can help you, they are or were a regular Wis-Con dealer. They have helped me out alot over the years. Wisconsin I guess is now offically out of business, but parts are still available.
I'm on the same trail as you are looking for a vh4d, for parts.
A few years ago I had to find a jug, for a VG, talk about an odd ball, I looked high and low for one, Engine Masters came through on this one. This is how I found them.
I hope some one picks up on this Wisconsin line in the future, there must be a jillion of those engines out there and I've got two of them.
Larry