Kitchen tap advice please

[alichambersUK]

Hi, basic question. I have a leaking kitchen tap. I'm a bit confused on the part I need to get.

On Screwfix I can see "Flomasta 1/2 inch BSP quarter turn ceramic tap glands" - are these the right parts?

But I can also see 8x8mm 20-tooth spines, 9x9mm 20-Tooth Spines and others - which of these would I need to get?

Many thanks for your help.

 

[cjg]

go to your local plumbers merchants they have a gauge to check the splines and if you req. hot or cold side.