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@Scilly.Suffolk
https://wheelsmfg.com/
The distance between 8 speed sprockets (the ctc distance) is different to 9 speed, so as well as removing a sprocket from the 9 speed cassette, you also need to change the spacing (increase it from 4.55mm to 5.0mm).
This is where the Wheels Mfg spacers come in.
I forgot to mention that you'll also need a 9 speed chain.
However as I said all this is pretty much academic, because they no longer make the kit (not that I remember it being readily available in the UK), so you'll need to find one second-hand.
And while you're looking for that, you might as well see if you can get a unicorn...