Pre 1950s rides of LFGSS: old bikes, vintage rats, classic lightweights

Would be a medium density wool felt. My measurements of the thickness of the originals is 1/8" for rear and 1/16" for the front, I might struggle to get that but 3mm and 1.5mm are possible.

These are the measurements I've taken:

• front OD 7/8" (or 22.2mm), ID 19/32" (or 15.1mm) , thickness 1/16" (or 1.6mm)
  
• rear OD 67/64" (or 26.6mm), ID 21/32" (or 16.7mm), thickness 1/8" (or 3.2mm)
  
  

The ID is right on the OD of the cones, I think this is ok, I can't imagine there will be much friction, especially after a few turns of a greased axle. They are supposed to be dust seals after all.