Mike,
You got it, I also understand your point but have had so many tell me that late 68 hoods are the same as 69 and 68 hoods will accept 69 inserts.
The fastest way for me to tell them apart was the cutouts under the inserts that can be seen from under the hood with the inserts installed. I know those early 68 hoods without the corners cut are the hardest to find now. Glad you had the post saved and it should be archived as I have seen a few posts asking about RR hoods, thanks for posting it again.