Re:
'second gen' was 1991 to 1993 model years.
Also as this is silver it's probably the cheaper and heavier 6061 OEM part that came on some bikes early on. Available to the public 1997ish (?)
I may be a later 7071 silver part from late 90's (?) with the wrong head but I think they are of the GT era design (~99+)
I have lowers with no heads, nobody ever ebays the heads/clamps