RAW Rapid Which B70005 Oring to order

[Daviddmund]

Referencing todays post "Regulators and O-ring Longevity" I have to order Orings for my RAW HM1000X regulator. I would like to order them from the Oring Store but am not sure which of the B70005 Orings would be the best for the small Oring on the RAW regulator (RAW part no. BS005). Or does it not make a difference which one I use?

Below is a screen shot of the B70005 Orings the Oring Store offers.

Thanks
David M.