I am looking for a lower front filler panel made out of steel versus the fiberglass or ABS sold through Classic Industries or Firebird Central; any recommendations?

Hard to find. Sometimes posted here, they go fast.
Try posting a want ad on facebook. (first gen sites)
There was a guy on PY a few years ago that was going to repop them, but never followed through as far as I know.
And 69 version is different, just so you know. ('67-'68 are the same)

Anyone have pictures of the OEM hardware that attaches this panel to the car?