[Rapid Ride]

Hello,
I am looking for headers for a Superformance Cobra. There is a set listed on eBay right now with some codes stamped on the flange... UN10262 and what appears to be a date code 11/04/12. They are listed for $899 for the set.
I have a mid 900 series Cobra with a 351 with aluminum GT40X heads. Does anyone know if these heads will in fact fit this car? Is this a decent deal? Are there better options for similar or less money?
Thanks for your help.