There was a front spoiler made by Direct Connection back in the day that fits that description, the JC Whitney one was probably a copy of that one. There’s been a few companies that have made fiberglass copies in the past but I don’t see any available at the moment. They do show up for sale fairly often (the copies, not the originals).
Spoilers by Randy makes a pretty good spoiler as well, his are actually sheet metal and pretty sturdy
spoilersbyrandy
