They did make a Montgomery Wards model that came with full suspension front and rear. I used a Kohler single cylinder two stroke engine.
I had one bought it just as a roller frame. But I had to let it go like so many of my projects. Member LOGSHAK had one with the proper engine I don't know if it ever got finished. It had a nice roll bar to support the top of the shocks. I have a manual on the machine if I could ever find it. I must be stored in the hundreds of boxes in the basement. I can't go down there.