Two of the injectors have been tested to be found faulty, after the car was emitting a lot of extra smoke, whilst idling and running, whether the engine for cold or hot.
I now need replacements for these two parts, the mechanic has said that the injectors cant be repaired as they leaking internally.
the part number on the injectors are (bosch) 0414720214, i have also been given the code 038130073BA, is this the engine code, how much I am expected to pay for second hand ones and where are they available from.

thanks