| Unit type D | |||
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| Unit type D consists of the following parts. | |||
| Part name | Parts photo | Number of parts | Number of cassettes |
| Double cassette c3 |
 |
X 4 | 8 |
| Quadruple cassette c4 |
 |
X 1 | 4 |
| Reinforced Quadruple cassette rc4 |
 |
X 2 | 8 |
| Braces made from a cassette case b4 |
 |
X 2 | - |
| Total | 9 | 20 | |