Way back in the late '70s, I had an LM1 parts car N555xxx with a rosewood. A bud had a loaded SS 396 auto N545xxx that had a walnut. Don't recall the exact VINs but that puts the range Nov 19-Dec 5.
The changeover may not have been immediate. 1st & 2nd design rear spoilers and 6/7 6/8 tachs are examples of changes that took some time to fully implement.