I once had a 1950's HD Servicar and a 1947 HD Knucklehead chopper. I cut the rear off the frame of each and welded the three-wheeler rear onto the Knucklehead frame. Sandblasted, molded, and custom-painted the frame, put on a restored antique sea chest with Model-T taillights on each side, Rocket mags with Firestone "Wide-Oval" tires, and a 27" over springer front end. Man, it looked sweet, and ran fast. Over time, I hit some hard times and sold the engines, and the trike frame ended up collecting dust in a barn in Wisconsin. I left the farm and my sister sold the trike (minus engine & tranny) sometime in the early 1980's. Still kicking myself over that. Wish I could find whoever has it now.