The originals are supposed to have a pentastar and part number moulded into the blade. First place/Trim parts reproduces the spoiler with the part number on the blade. Here is a description and link to the page.
Concours quality reproduction spoiler kit includes the following: FP100 wing blade (hollow, black ABS plastic construction as original--NOT fiberglass. All dimensions are same as original, i.e., thickness, taper, length, width, height, crown, and curve), a Mopar Authentic Restoration Product with molded in PN and Pentastar
FP201 wing to pedestal attachment brackets (improved cast aluminum construction); (2) RS190EW pedestals (hollow zinc die cast construction, powder coated black, Mopar ARP with cast in PN and Chrysler Pentastar)
https://www.fpap.com/proddetail.asp?prod=FP108