Taillights - Early/Late?

When I first purchased my 71 LT1, I didn't notice that it had two different taillight lenses; one pointed and one rounded.

I learned that "early" 71 Vettes had the pointed lenses (as in 1970), and "late" 71s were rounded.

My question is, what serial number Vette was the last if the "early" version? I'm not sure which lense is correct for my Vette.

You might try checking with the NCRS.