I picked up some HONDA badges for my GL1000 years ago on eBay. My shelter sides were filled in and painted smooth. When I finally got the paint right, I placed some painter's tape on the tank to mark for positioning and level, then put 3M VHB double-sided trim tape on the back of them and trimmed any excess off with X-acto knife and straight-edge razor blade. Ended up looking great, and surprisingly the tape is so strong that it smooths out places where the curvature didn't initially match.