The OEM front fender has the tendency to throw dirt over the front of the engine. I installed a Fenda Extenda to keep it a bit cleaner. Had good experiences with the same product on my DL650.
As always 4 tiny screws are provided to mount it, whoever uses them, drilling their front fender, I have no idea
2 strips of adhesive tape are pre-installed on the fender, but I also don't put alot of faith in those. Some silicone kit is all you need;