System 2.7

| L 12 | SS | self-tapping

| L 14 | SS | self-tapping

| L 16 | SS | self-tapping

| L 18 | SS | self-tapping

| L 20 | SS | self-tapping

| L 22 | SS | self-tapping

| L 24 | SS | self-tapping

| L 26 | SS | self-tapping

| L 28 | SS | self-tapping

| L 30 | SS | self-tapping

| L 32 | SS | self-tapping

| L 34 | SS | self-tapping

| L 36 | SS | self-tapping

| L 38 | SS | self-tapping

| L 40 | SS | self-tapping