Can't help with the part numbers, but my understanding has always been that the "oval" valve stem cutout was the only factory installed design for 15" trim rings in 1969. I've attached a picture of a survivor trim ring. The "racetrack" cutout (your pictures) is not a factory installed design. Skip (and you) know a heck of a lot about these cars though - so I could stand corrected. Good info.
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