If the Zaibatsu Corporation doesn't have a bad relation with you, this mission will not be hard.
First, you must find the parked Z-Type. A pink arrow will show the Z-Dealers' location.
The places are:
- Train Station in Bayano
- Hospital in Bayano
- Escobar Power Cores (if the Zaibatsu's hatred towards you is big, you'll have a hard time; there will be many of them carrying Rocket Launchers)
Once all the Z-Dealers are in the car, deliver them to the Crane. As a reward, you will get $40,000.