No, I don't think you're blind. AFAIK, the actual part number was not stamped on the latches. That's assuming we're talking about the safety latch that mounts on the hood, correct?
If you'll post a picture, we can confirm that what you're looking at is the '69 Charger variety. From the date codes (and I agree with Chris that the #s you posted are date codes, although there weren't 76, 228 or 353 weeks in any year

) they're probably '69 pieces.
