Survivor? original? Or numbers matching?

I think I feel that original and numbers matching mean the exact same thing in my opinion.

Survivor is never modified.

But you could have a original survivor which would then be numbers matching.

I going back to my car. If I bought the date coded correct manifolds I would feel and not hesitate to say that the car is numbers matching and all original. But people made comments that it wouldn't be original because those were not the original manifolds.

So how big does the replacement part have to be in order for the car to loose it's original classification. Like I said. If the some light cover broke and you replaced it with era correct part with part number...know one could ever know it was replaced...same thing with proper date coded manifolds... Know one could ever find out they were not original to that car.