Hi y'all. . 2001 R1150GS. I had to lift the tank to reach the battery. I removed the seats and popped-off the little side fairing. Forewarned, when removing the tank bolt I kept my hand behind it to catch the nut before it fell into the void. I'm almost positive that I didn't miss anything. Come time to button it up, I happen to find an extra part tucked behind the cables. Here's a photo of the bolt/washer/nut on the left. And the mystery part on the right. Do any of y'all recognize it? It has a rubberized washer on the inside. It looks rather like one of the three receptacles for the side panel that pops on and off. But they're all present and correct, as far as I can tell. Any clues? Thanks for your help.