Up for Buy-It-Now is a new old stock set of 8 valve springs, Ford part number C8SZ-6513-B.  These were obtained from an old service garage and is not a newly remanufactured part.  According to my Ford manual, these are used on the following models and years:

1968-1972 Ford Full Size , Thunderbird, Mustang, ..With 429, except Police Car, Cobra Jet or Super Cobra Jet

  The springs are in brand new, never used condition and are free of any damage.  The original Ford box is in good condition.  Please feel free to E-mail me questions.  International bidders are always welcome.  Thanks for looking!!!