Ambulance 4WD buying inquiry from Oman

WE have interesting to buy new ambulance as per below specifications
1- 4WD
2- Diesel Fuel
3- ABS System
4- Automatic Gear
5- High Roof Emergency Cabinet prefers
6- LHD must be as per Gulf Countries System
7- As per GCC Certificate specifications or Toyota, Nissan, ISUZU,GMC,FORD And Mercedes