I can pretty much ensure that there are no "irreplaceable" cars being destroyed in the course of shooting most entertainment. The mere nature of the production makes destroying something that's hard to replace a bad idea.
In fact, I'd be willing to bet that high-profile destructions of cars on-screen actually benefit the marques in the long run by creating interest in the particular model. How many "Eleanor" clones would just be rusty Mustangs in junkyards today if it weren't for Gone In 60 Seconds?
jg

