1. When joining the new and old parts, temporary install and fit the new part in position, measure each dimension according to the body dimension, the adjust the position to align it to the standard dimensions.
2. Drill holes for plug welds before installing new parts.
3. After installing and temporarily install the inner, reinforcement and the side sill reinforcement, plug weld during installation of the outer.
4. After temporarily installing new parts, make sure the related parts fit properly.