1. When joining and cutting the new and existing parts, trial fit the new part in position, then measure and adjust the body as necessary to conform with standard dimensions.
2. Drill holes for plug welds before installing new parts.
3. Weld in 5 locations indicated by (A), then trial-fit the inner and reinforcement.
4. Weld in 10 locations indicated by (B), then install the inner and reinforcement to the existing parts.
5. After temporarily installing new parts, make sure the related parts fit properly.
