For the indos to buy 120 tanks is stupidity apart from Java and bali where are they going to use them, you would have to put tracks through the jungles with a D11 dozer first and while thats happening a handheld RPG would knock the tank out. Better to buy 100 landcruiser triple axle pickups equipped with heavy machine guns
The helicopters at least would have some capeability although would think the technology is too advanced for the indos due to their poor maintenance record with aircraft.