http://cgi.ebay.com/ebaymotors/1987-Ford-Thunderbird-Door-Release-Handle-Trim-Cup-NOS_W0QQcmdZViewItemQQcategoryZ33705QQihZ020QQitemZ300106854114QQrdZ1
Isn't there an effort to reproduce these? This might be an opportunity to get your hands on a mint one for use as a template.