The Kuryakyn 8372 rocker box bolt covers allow you to customize your motorcycle down to the detail. Provides a final touch that makes the difference. Simple push-on installation. Includes (4) peaked rocker box bolt covers in chrome. The Kuryakyn 8372 rocker box bolt covers are compatible with Harley-Davidson models: 99-17 Twin Cam Engines and 17-19 Milwaukee-Eight Engines.