go here i have used this particular spec of terrano as an example, but select your year and model and it will give you the part numbers to take to where ever to get new one's
illistration at the top, scroll down for part numbers
The numbers are on one of the flats of the 19mm hex of the body of each injector ( just under where the leak-off rail sits.) Tricky to see without a light and a mirror. You should see the numbers 0050 and either letter B or T . The letter determines the nozzle number. (I can supply exchange reco injectors )