For OE look, take the cover off your existing regulator, repaint it Ford blue and apply the repop sticker. You can then install that on your new voltage regulator.
Those reproductions look nice, but I would not trust them for reliability. My best results have actually been with OE Ford solid state regulators that I scavenged off cars and trucks in the pick a part yards.
If you're buying new, get a Motorcraft GR540B or Standard VR-166 (not the 166T).
You can also find NOS electronic Motorcraft units on eBay under GR540A.