Posi-track MD70

I have a posi-track MD70 and I somehow managed to break the coned drive sprocket. I live in a very wet area and have yet to find a machine other than this old posi track that will stand up and work on the muck.

The part is no longer available and I have tried every salvage yard and parts location service I can find, with no luck.

I know there has to be one in a salvage yard, back lot, fence row somewhere that I could buy a part off of or the entire machine.

Hoping that someone here may...

Posi-track MD70

Posi-track MD70