Last year at Charlotte I met a parts guy that had a rear engine racer in the second building where we held the tech seminars. He had on display a brand new rear engine racer that he was using to promote his business of building that kart. It was a kart similar to the one in my Avitar. I lost his card and I want to purchase a second engine mount to put twins on my 1957 AlleyCat. Can anyone help?