you will need both bearings plus the water seal and lubricant for the seal
you might need the tub half gasket but a lot of the time these go back and seal but you never know
you will have to check the drum shaft for wear and corrosion first
site shop seems to have parts
i think water seal may be this one but you need to check
https://shop.ukwhitegoods.co.uk/754132252-smeg-washing-machine-bearing-seal
the 2 bearing are fairly generic and shop should be able to point towards correct ones
Dave