If you have a 1" fork now, you can get a 1" threadless. 1 1/8 will not fit in a 1" hole.
Or, get a regular 1" threaded fork, and get a stem adapter so you can use a modern stem with it. That's what I use on my classic steel road bike.
Last edited by Homebrew01; 06-05-14 at 05:15 AM.