I hear Wally is selling off his, and he has lots.
Try Lotus-Cortina.com, there are some links, and a mailing list. There is a link there to Simon Horton as well (Rancho Cortina). He may know, although he sold his already.
It is worth looking at "The Ford Cortina Web Site" classifieds, even though it is an Australian site, there are USA cars listed.
www.pixelmatic.com.au/cortina I have to send out E mails from my own ISP when I look there. The E Mail links in the classifieds are not working for me.
Wally definately has them for sale.
Good luck and let us know how it works out.