Jesper, looking at
THIS THREAD, it appears you asked this a few years ago, but I guess you never got a reply.
To be honest, we don't condone reproduction trim tags because they're mostly used to fake cars. For example, there are now more 69 Z28's in the world than the factory originally built because of these fake tags.
There's no real way to create a trim tag based on your VIN - 124679N697074 - because the data's now gone. The only other information would be the build date, paint and interior codes and the Fisher body number. Your car would have come with an X code, but without paperwork, there's no way to know what any of this would be, so my vote is to just leave things as they are and not worry about it.
Ed