Atomic SS1 O-rings

[DiveGusto]

Does anyone have a cross reference. Most are common 010, 011, or 008 but two are different.
The way they list them are in this format 20-2010-00 The ones I don't get are 20-4520-00 (which is slightly larger than a 20-2008-00) and 20-7150-00 (which appears to be between a 010 & 011)
i need to rebuild it since I couldn't get a breath on it last dive but the inflator & deflator worked fine. Took it apart and could not find any issues but now need the right o-rings.

 

[Tbar]

Can you measure the o-ring? the ID and the thickness.Can you measure the groove that the o-ring goes onto (ID)?

The o-ring should be slightly smaller that this (about 2%).You will also want to know the hardness.

Are these in a HP low LP use? are they dynamic or static?