Most of the interior pieces that are even available through Ford are only available in one color to simplify part #'s. You can buy the blue vinyl dye through Ford and it will match great. I have done this with a few parts already.
Otherwise there are always a few blue interior T-Bird's at the U-PULL-IT yards around me. I saw two yesterday as a matter of fact and I wasn't even really looking for them.
Check around...The late model interior parts aren't that hard to find.....Yet