bjc 350....Nailed it!!
Like others suggested I thought maybe it was for the hood latch, but i had foam there and it was shaped differently like the pic cvxjet posted. I had searched everywhere for some adhesive residue but to no avail. I’m guessing either the release agent used when forming the plastic sunroof shelf or the plastic itself, didn’t allow the tape to adhere properly.
Interesting side note... After i posted this question, I was searching the forum for some direction regarding LED lights. I came across an old thread where a member was selling them and he posted pics of his car with the new bulbs. Check out the picture from under is front hood and look at the spare tire / holder rod and you can see the same piece of foam sitting there! Must have fallen off his sunroof shelf and stuck to the spare wheel like mine.
Mystery solved and apparently its a rare piece of fiero foam history!