The small, lower gearlever boot to seal the top of the turret. Mazda MX-5 & Roadster manual models 1989 to 2005.
If your gearchange is notchy and stiff, chances are that this boot has split and you've lost the turret oil. Things are often significantly improved by re-filling the turret oil and renewing this gaiter (and the upper gaiter too). Genuine Mazda part.
M51317480A. NM00098.