Hi Robert,
You can buy "Challenge" hand made "paris-roubaix" 27mm wide tubulars. These are supposed to be made in the actual clement molds, which are now in Thailand, in the factory that makes the currently available models from vittoria and clement. There is a distributor called 'quality bicycle parts' in Bloomington, MN that most bike shops deal with, and they should be able to order them for you. Expect to pay $50 to $60 retail per tire. Hope this helps.
grant mclean
toronto, canada