Where do I find the 7 digit pin code to reprogram my 2005 Ford f-150 xl 4.2 litre,

Question

I need the chipped key code or PIN code that I think is seven digits long for my 2005 Ford f150 XL 4.2 l rear wheel drive so I can reprogram my key to the truck because I unplugged my immobilizer and now it's locked me out I have the little computer to do it I just need the 7 digit code and the dealership won't give it to me I don't need any retarded answers I just need to know the location or how to find the code please and thank you