Anyone?
Edited Date/Time:
Unless it HAS to be Pro Circuit, check some of the Euro companies like BUD Racing. They have "works" style too.
https://www.budracing-usa.com/us/dirt-bike-parts/engine/exhaust/2-stroke/factory-pipe-bud-racing.html
I think chaparral has one on the rack behind the tires. raw finish a lil rusty needs some tlc.