Got a Barton shifter today, but I'm missing a part

Does anyone know what this rubber ring is called? I'm having my Dodge service center install a Barton shifter I bought from American Muscle while my Hellcat is in for service to repair the clutch pressure plate and actuator. While it looks like it just prevents the edges of the Barton shifter body from being scratched when rotating in the shifter console opening, I don't think it's a showstopper from having the Barton installed. I sent an email to Barton Industries this afternoon requesting a replacement, but I didn't know what to call this piece.