Where would I find...??

The "sequence number" markings on a 1976 308?

I have a fiberglass 308 that is supposedly the last fiberglass car imported into the US before they started importing steel bodies. I am looking to see if the sequence number (not the serial number) is stamped or handwritten somewhere on the body, body components, or in the engine compartment.

Anybody know???

My guess is that, if this is correct, the number I am looking for will be about
100 or 101 or something like that.

Thanks for the help. If I can locate it, I will report back.

Mark