| Model Code | Description | |
|---|---|---|
| 01 | 638.014, 638.034, 638.064, 638.068, 638.074, 638.078, 638.114, 638.134, 638.164, 638.174, 638.194, 638.234, 638.274 | TWO ADDITIONAL REAR LOUDSPEAKER |
| 02 | 638.014, 638.034, 638.064, 638.068, 638.074, 638.078, 638.094, 638.114, 638.134, 638.164, 638.174, 638.194, 638.214, 638.234, 638.244, 638.274, 638.294 | TWO HIGH-QUALITY REAR LOUDSPEAKERS V CLASS |
| 03 | 638.114, 638.134, 638.164, 638.174, 638.194 | TWO HIGH-QUALITY REAR LOUDSPEAKERS CEW BUS |
| 04 | 638.014, 638.034, 638.064, 638.068, 638.074, 638.078, 638.094, 638.114, 638.134, 638.164, 638.174, 638.194 | TWO ADDITIONAL REAR LOUDSPEAKER/VITO "F/L" |