Scott, here are the parts houses that I know of that have 1955-1957 Tbird parts. CASCO is probably the best known. Maybe they might have what you are looking for.
Here is the contact information for a well known Babybird parts supplier. Phone # 1-800-374-0914. International: 740-622-8561 Fax: 740-622-5151. E-Mail: email@example.com
(parts department) Located in: Coshocton, Ohio.
Larrys Tbird Parts
National Parts Depot
Concours Parts & Accessories
AC Parts House
Some of these also sell '58 Tbird and up parts. CASCO is '55-'57 only.