I found these fans/shroud on eBay. They are supposed to fit Champion/American Eagle as well as stock replacements. I cross-referenced the shroud dimensions to the Spectra radiator and it should work. These fans look to be the same fans that come on the $350 American Eagle radiator/fan combo.
https://www.ebay.com/itm/ALUMINUM-RA...4AAOSw7XNc0cUh
So is there any reason to go with the Spectra/eBay combo over the American Eagle package? They come out to the same cost.