| Type | Dimensions | Drawing | ||
| g | d | L | ||
| R16 | 16x16 | M16 | 170 | ![]() (BN-85/1922-05) |
| R18 | 18x18 | M16 | 190 | |
| R20 | 20x20 | M16 | 210 | |
| R20/M16 | 20x20 | M20 | 210 | |
| Type | Dimensions | Drawing | ||
| g | d | L | ||
| R16 | 16x16 | M16 | 170 | ![]() (BN-85/1922-05) |
| R18 | 18x18 | M16 | 190 | |
| R20 | 20x20 | M16 | 210 | |
| R20/M16 | 20x20 | M20 | 210 | |