ok, my car is equipped with hella h4 housings and bulbs. did the firebirds come that way from the factory in 1992?

the little 4W bulb replaces the parking lights since yellow parking lights aren't allowed in europe.

Not sure what you are asking about but I assume you have the same rules as in Australia
I fitted an extra globe & socket into the parkers & rewired abit so now when I have parkers on they are white & when I indicate they are yellow.
Hope this helps or am I way off what you wanted to know?

i was wondering if the car came with the hella h4 lamps from the factory or the stock lights were replaced by them

I do not have standard headlamps coz they did not meet Australian standards/ADR requirments
headlamp for 92 firbird as far as I know is "H4666"