There are 3 different bushings. 2 are Fibre and 1 comes in fibre or brass. The small ones came in the brass or Fibre. the fibre material was like a cross between wood and phenolic. The went in the Bogie assemblies. the 2 larger ones also were part of the suspension going in the rear and front positions. I had brass duplicates made, but various types of hard plastic, Nylon or HDPE would work well too. I gave all my spares to Warren Jones. However, you could take the 2 pieces that give the inner and outer dimensions to a machinist and he/she could fab the parts based on the external shaft dimension and the internal sleve holder. Christer in Sweden would have the actual dimensions as he has all the blueprints.