Thread Adapter Screw Adapter Aluminum 1/4 Female/ 1/4 male to M4- M5 M6- M8- M10 | eBay
M8 Adapter – SnakeClamp Products
Amazon.com: 1PZ MXM-001 Mirror Mount Adapter - M8 female to M10 male or 8mm to 10mm Chrome Replacement for Honda Custom Cafe Chopper Bobber Tracker Vintage Classic Kawasaki Yamaha Suzuki (Pack of