It was a promo truck built for Royal Purple (notice the D44 cover and the oil filters) and had many sponsors supplying parts. So it came out of a marketing budget/business write off. BTW, you can now get the bumpers, but they are pricey.
http://www.calautocreations.com/projects-2/66-bronco/
i do love the look,
however i truly believe these dealers, promoter of parts are in collusion,, they all build one and put a extremely high price on them,,their are 5-10 high end ones that have been posted for years,,, most probably don't want to sell them,,,so they can in turn snatch up the remaining broncos on the market, spray paint them and resell for profit, along with selling parts...
just the thoughts of a frustrated buyer that is still looking for a good deal