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Another option that i forgot.. I think some base birds had fog lights and the "same" bumper GTA front but without the gfx..so basically a Formula bumper but the provisions for the fog lights. Thats kinda rare though it seems.... all base birds I ever see have the gfx added.
What I just thought of.... since youd have to be able to change the bulb in the turn signal anyway.....you could check under your nose at the impact bar to see if the hole is big enough for the stock fog lights..if it is / the same. . install them....... then remove the Black Formula bumper insert, cut it for the fog light and replace it. that way it will lock stock but you can throw in some LED bulbs too.
These will work, 20 years ago I put in these, well probably not the same brand, Blazer was the brand I think but they look exactly like the ones I put in. For an aftermarket part this is as plug and play as it gets.
This post shows the brackets as well [Sold] 91 92 firebird fog lights - Third Generation F-Body Message Boards