If you mean the 597mm ones to fit (English) EA1 rims I think that Kenda are the only ones left making tyres that will fit, by virtue of the fact that they are still making them for Schwinn S5 26" x 1-3/8 wheels?
The DO fit, although they are a little chubby. If, however, you come across suitable NOS tyres by another manafacturer (EG: Schwalbe, Dunlop or Michelin, etc.) ferretted-away somewhere, buy them all!
Googling for "26 x 1-1/4 EA1 597" should find you web-sites selling these Kendas ...
Alan Lloyd (Schaumburg, Illinois, USA)
> Date: Thu, 17 Apr 2008 20:08:10 -0700
> From: "stephen" <sbryne@comcast.net>
> To: <classicrendezvous@bikelist.org>
> Subject: [CR]Source for 26 x 1 1/4" tires?
>
> Does anyone out there know a source for replacement 26 x 1 1/4" tires. The
> originals were Michelin Roadmaster blackwalls Made in England. Thanks for
> any information
>
> Stephen Bryne
> In Springlike Fairfax, CA, USA