68 Dart quirky parts-classic tunes

I read a while back line parts "Parts assembled to the car while going down the assembly line'' and NOS New Old Stock parts were not always the same exact part.Sometimes there would be differences between the two.This could be the case on the arm rest.Now I guess the new way of thinking now is to restore your car with line parts and not NOS.Of course this way of thinking is for the guys with endless suppy of money..
Jim