Joes no flats problem

I wanted to convert to tubeless, so I got some tubeless ready tyres and I measured my inner rim width to order 'joes no flats' kit.
My inner rim width is 21mm so I went on their website to find out which one and went for the 'all mountain' kit as it says fits all rims 19mm - 25mm inner rim width. I ordered the kit from chainreaction - when it came, it says on the packaging "compatible with inner rim width of: 26" - 23- 25mmm, 27.5" - 20 - 24mm, 29" - 19 - 23".
My wheels are 26", so this would suggest that this kit doesn't work. However, the 'all mountain' kit was the only one that says it does 21mm rim width, so I guess i need to return it or use it anyway.
Does anyone have any experience of this, or of this problem?
My inner rim width is 21mm so I went on their website to find out which one and went for the 'all mountain' kit as it says fits all rims 19mm - 25mm inner rim width. I ordered the kit from chainreaction - when it came, it says on the packaging "compatible with inner rim width of: 26" - 23- 25mmm, 27.5" - 20 - 24mm, 29" - 19 - 23".
My wheels are 26", so this would suggest that this kit doesn't work. However, the 'all mountain' kit was the only one that says it does 21mm rim width, so I guess i need to return it or use it anyway.
Does anyone have any experience of this, or of this problem?
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The CRC site does clearly state the different widths for different wheel sizes in the description for the Joe's kit. I'd return it and buy a Stan's No Tubes kit. They're more expensive but also appear to get a better reputation. You also appear to get more sealant with the Stan's kit.
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