Several notes regarding this task:

1. The task description never mentions vehicle spare parts by name or implication.
2. The warehouse on the map where the task takes place that has vehicle spare parts is locked behind a contract, so unless it was already unlocked the map will not actually point the player anywhere when vehicle spare parts objective is clicked on. This can be confusing, as the tasks are usually contained within the same map.
3. If the cargo was meant to be groceries then consumables would be a better fit, in line with what that type of cargo is implied being most of the time.
4. If the cargo was meant to spawn by the "car", Loadstar couldn't carry it as it lacks a cargo bed.