| 1 | 21J-63-X2500 | CYLINDER GROUP,1ST BOOM | |
| |1 | 21J-63-X2301 | CYLINDER GROUP,1ST BOOM (SEE FIG.Y1620-01A1) | |
| 2 | 21J-63-X2510 | CYLINDER GROUP,1ST BOOM | |
| |2 | 21J-63-X2311 | CYLINDER GROUP,1ST BOOM (SEE FIG.Y1620-01A1) | |
| 3 | 21J-63-X2350 | CYLINDER GROUP,2ND BOOM | |
| |3 | 21J-63-X2320 | CYLINDER GROUP,2ND BOOM (SEE FIG.Y1620-02A1) |
