- Installation Video: How To Install ProBEAM Flat Bezels for Harley Davidson Motorcycles September 15, 2020 13:34 Updated How To Install ProBEAM Flat Bezels for Harley Davidson Motorcycles Related articles - Troubleshooting: 1157 Turn Signals Tech Bulletin - Installation Video: How To Install ProBEAM® 1157 Bullet LED Turn Signals for Harley-Davidson® Motorcycles