Fuel Injectors I need to replace one for cylinder 5?

Here is the engine cylinder ID so you replace the correct fuel injector, also I have included instructions on how to do the job. Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car.

https://www.2carpros.com/articles/how-to-replace-a-fuel-injector

Check out the images (below). Let us know if you need anything else.