Just about to order from Cousins a Rolex Oyster Quartz caseback tool (assume it's the 29.5mm diameter die?) enabling me to change the battery myself but will likely also need a new gasket and not sure what size or type of seal/gasket is required until the back is off.

Can someone please advise which of Cousins 'mixed bags' of seals/gaskets I need to order to match whatever seal is currently fitted?

https://www.cousinsuk.com/category/o...rubber-gaskets

I'm not buying the whole set of dies just the one die and wrench for the time being and will order Cousins 'own brand'.

Thank you

dunk