Are you mixing your own paint? If not, Eastwood has two part epoxy products in spray cans. I suspect they would have a chassis color. As far as the wheel wells go, the most authentic looking product is going to be rocker schutz, but I'm not sure if it is still out there and it requires a special gut to shoot it. Other great products are SEM self etching primer covered with their Trim Black which are both available in spray cans. The trim black has lasted more than a decade on my trim, but I must add that I used PPG epoxy primer under it. I would find a local auto body supply house and pick their brains there if you cannot find answers here though. Good luck!