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@Halbert
:) Do you know anyone who can manufacture those?
a friend of mine actually custom-made some spacers in 3.25mm thickness with 36mm internal width .. I believe those are the necessary dimensions, and you'd also need a spacer behind the cassette& a 0.45 mm spacer for the smallest cog which has "built-in" spacer.
costs about 0.99bucks to manufacture this kit from plastic..