spline

I recently bought a couple of ceramic tap cartridges for my basin taps - went for type "CC2". Although I was careful to get most measurements correct, I didn't notice that the spline section is a larger diameter than before - gone from a 20-spline 7.6mm to 20-spline 8.8mm, so of course my lever...

Hi I need to replace tap gland (internal bit of sink tap). I pulled it out and measured but it is difficult to match with products on wicks or screwfix. All looks same. Can someone look at attached image and check links from screwfix or wicks and suggest me the right product...