I know I need to keep the mounting hardware from my stock 99 WR seat (two rear mounts) however; I have a few questions: 1. If you were sitting on the bike, do I keep the left or right stock tank mounting bracket? 2. Do I need to take the front seat mount post off the stock tank? 3. IMS tells me I do NOT need my stock petcock. Does anyone disagree? 4. Is it inevitable that the natural IMS tank will yellow? I look forward to your feedback.