I have (2) Shimano 9-speed spaced cassettes in which the outer spacers have been milled to adapt a Miche 1st position cog for 6 speeds. They have been designed and work perfectly for either Hope or Hadley singlespeed hubs. They require a 15t Miche 1st position cog like this one: https://www.modernbike.com/miche-shi...-cog-8-9-speed.
The cassette carriers I am selling include the cogs 32,28,24,21,18. I find the Miche 15t to work best for the 6th gear. Below is a list of what I am selling:

Brand new XTR with the 4 largest cogs being titanium for $140

Slightly used XT for $70

Shipping fee depends upon location.