I thought that I could document this, but now that I look in my usual sources, I cannot. The fellow I bought the screen from told me the story that I reported, and I thought that I had subsequently read the same afterwards somewhere or other, but sorry - it's not to be found just at present.
So that may have been an overstatement; maybe the guy bought the screen as a new part, and did the upgrade unofficially, as it were. But he did say specifically that it had been available as an upgrade, and as I recall, he knew the Apple lore pretty well. But I'll just "withdraw" that little slip for the moment, if I may.