Noob SubC crystal gasket diameter/selection?

[GenTLe]

I have a couple of Noob subC, a hulk v3 and a black V5 (and also a BP PRoHunter GMT 2). Measuring the diameter of the crystal, without taking it out, I read around 30.4mm, so I suppose it is a 30.5mm as normal for a Noob one.

May someone help me to get which is the right one 2.3mm tall to select?

At cousins, if I check in the "Rolex non branded" parts, I can select up to 29.6mm (internal) size: https://www.cousinsuk.com/product/glass-gaskets-iso-swiss-additional-sizes

or 29.5mm: https://www.cousinsuk.com/product/glass-gaskets

I'm a bit lost...

 

Thanks in advance!

GenTLe

[GenTLe]

Thanks to botsyboy (RWI) I got the size: 29.5mm, on CousinsUK it's the R30520

 

THe fact is that the crystal of rolexes are smaller in the hidden part, so even if outside it is a 30.4mm, then below it's a 29.5. See a Milgauss one for example: