Here’s an M170 clone for auction on eBay.

The owner states

“This one has the original buick V6 with three speed tranny.  Most of these have rusted away long ago but one this seems to have held its own.  There are a few pin holes in the front floor but it looks pretty good otherwise. (See photo of floor just below gas pedal) I do not see any bondo in the body.  the engine does not smoke or leak and runs well.  The previous owner put on new shocks, new springs with two inch lift, new top with all new snaps, new Ultama Battery and the new BFG 31 X 10.50 X 15 tires.  I have put new U joints on both front and rear drive shaft, rebuilt the drag link and Bell Crank (steering components).  If I were going to keep it, I would put a new bearing in the Bell Crank Braket as well because there is a little play there.  The tie rod ends seem tight”