Hey Fellas, just wrenching on my new to me, used sled. I'm throwing a fourth wheel kit on the rear axle so I was lifting from the rear bumper. I noticed that there's some looseness in the joint between the main tunnel and the extension. Some of the Rivets look like they need replaced. Is this a known problem and can I buy black rivets from the dealer, or do I need to paint them after replacement? Any advice is welcome, thanks.