Surplus Center Info & Discussion Forum

I was looking at item 16-1364 on this site.  It sure looks like some special high performance fans for Mustangs that I've seen in aftermarket catalogs.  Does anyone know the story behind these?

I googled the Derale Model number 16934 and found that a couple mail order places sell the same fan for around 215.00 dollars.  Pretty good deal at 129.95 for a high performance dual fan assembly. I believe Roush might have used these types of fans on some of their high performance Mustangs, not for sure on the years.