Injector help; please ....

Hi. I have a 2012 Megane Coupe 1.5 DCi, and am looking to buy a 2nd hand replacement injector. I would be grateful for two pieces of advice;

• where is the best place to source such a thing; I’m really struggling to find a 2nd supplier
• how do I confirm it will fit my engine? A number of suppliers quote engine codes, is this the failsafe check, and how do I find my engine code?

thanks in advance.

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