where do i find the part number/code for the injectors?

What is your question?

I actually have a 1999 Golf 2.3 V5 (your drop down list doesnt list it). I am also in the united kingdom so your "zip code" wont accept my digits so I have used one from florida. Its got a faulty injector on cylinder 5. I have some options on ebay to buy a replacement but I need to ensure I get the right one, with the right part number/code. I just need to know where to find the part number so I buy the correct replacement.