Interesting. I am assuming it has TRD stamped on it? It is funny watch people try to sell standard S series 4 pinion centres as LSD's when they clearly aren't, however I doubt you would post without being damn sure its LSD. Got any pics of it? I have never heard of a D series LSD either so will be a rare item either way.
You say it is bigger than Starlet 6" (U code), I know the B code looks physically smaller than U code so it could be a U code. Or have you got a known U code to compare? While the whole centres do interchange (if axles swapped) the pumpkins are different.
Will e-mail a guy I know who has both B and U code LSD's and might be able to clarify what you have.
Callum
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