He's looking for the plastic ring that goes around Battlezone sticks and happens to also go around the shifter for a Pole Position.
My PP ring is broke, and I was lucky enough to pick up a NOS one from Brentradio (i do believe it was him).... if yours is more than just broke in a single place you can have my "broke" one (this one is complete, but it has a single break that could be glued if you wanted...)... Let me know.
Thanks for everyone's replies. Yes I am looking for the joystick bezels, the black round parts that go around the two BZ joysticks and around the Pole Position shifter.