Organic Engines went out of business in 2013 so proprietary parts are going to be hard to find and maybe non-existent. The good thing is that most wear parts are not proprietary. I own a vintage Haluzak Horizon and Bill Haluzak closed shop even before Organic Engines stopped production. The owner of Organic Engines had a real history of being unresponsive to customers near the end. Lots of complaints about him similar to what Windcheetah owners experienced (but maybe not quite that bad).