mexicanyella

"Stinger" is technically what you call the skinny tailpipe on a two-stroke's expansion chamber. If you say "stinger" in ref. to a Honda 50 pipe on PM, people will know what you're talking about. In Honda-speak, it's probably called a "diffuser" or even worse. Possibly a "spark entrapment matrix tube" or something. Maybe just "baffle."

If you just want to get the exhaust past the shock and fender for your own use, you could find a piece of tubing that's a snug fit inside there, drill a small hole in it and run a sheet-metal screw through the existing hole into the pipe and the small hole you drilled and put it in there. If you want to sell the bike with the correct exhaust, be patient and a stock pipe will invariably turn up. I got mine from a PM'er named cdoublejj, who sold his stock pipe after putting on a Minigunz or something on his '74. In your case, just keep an eye on the classifieds and on incoming "build" posts. Someone will mention tossing their rusty stock pipe for an aftermarket one, you shoot them a PM and you're in business.