Brake light, the stock light doesn't have one, its only a running light, can pick up the pressure switch banjo bolt at Apex. Horn, I think I still have a honkey horn in my box o parts, I'll need to check and get back to you. Rearview. Modette really likes his Acerbis, its composite and folds away easily. DOT tires (depending on the inspector) I run without. Might be able to borrow a pair for the inspection just to be safe. Speedometer of some sort. Keep in mind the electrical system is AC so any aftermarket stuff needs to be self sufficient or AC capable unless you want to mod it like Me and Modette and most of the rest of the XRR riders to an AC/DC system. Also depending on the trails ridden, you will either want Evans coolant or a KTM fan on the radiator (requires DC) A slower group climb up Mosquito will boil it over without. If you want some more advice or help with the electrical, or just to check out another XRR that has been throughly dual sported let me know, looks like the next couple of days are supposed to be really nice so I'm going to get out riding.