If your generator is AT-ML180 the replacement stylus must be ATN180ML.
But if your generator is not the AT-ML180 then you don’t have any problem to chande the styli, because 170,150,140 generators are the same (electrically). However, for the same reason you can't use ATN180ML stylus from AT-ML180 cart on any other cartridge in AT-ML line.
So i think the only option is to refurbish your existing stylus by someone who understand that at-ml180 is very special cartridge.