Goodmark vs. GM body panels. How do they compare?

[FESTIVAL78]

I'm chiming to say that Sam is right..Some NOS is "dull" and unless your car is just a regular car Goodmark is substandard..Funny that no one ever mentions that original sheet metal has plant codes and week of the year stamps on them..This will be the next level of originality in the years to come, so if you don't save what you've got or match it with used from the same general date zone then regret will follow..could be 20 years from now, but it's coming...