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There were 49,213 77s built and just about midway through the
production cycle GM saw fit to make a few changes,such as the
switch for the alarm system was moved from front fender to the door
lock and I think this is when the change was made to the T-Top
weatherstrip also.Really its not a big deal.
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
two easy ways to tell: one is to look at the A/C unit in the pass fender well......the early one is two parts where the later one is a one part unit and the middle of the unit is crimped together...also the radiator overflow tanks are different