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@gbj_tester
So make one. All you need is the spare parts lists for Ultegra and LX MTB cassettes and a bit of imagination.
Ultegra:
14t top sprocket (built-in spacer type)
15/16/17 loose sprockets and spacers
LX:
Y1YR98040 Sprocket Unit (18-20-22T)
Y1YR98070 Sprocket Unit (25-28-32T)