Cut 4 mm on 2 of upper seatbelt brackets 6-B-21-3, deburr and primer all 4 brackets. Together with lower brackets 6-B-18-4. Prepare for installation, but lower AN3 bolt was in conflict with one of rivets for main gear support. Had to cut 2 mm from end of rivet to create more space. Installed and torq AN3-05 bolts with double washer and locknuts. Torq to 5Nm.
