Huma Reg for Leshiy - O-ring size

So I received a Huma Reg as part of a used gun purchase from one of the larger air gun vendors. Unfortunately, the reg did not come any O-rings..either installed or as spares.

I contacted Huma, because they list 3 O-ring kits for the Leshiy..Standard Edgun Reg, Huma with 15-8 piston, and Huma with 12-6 piston. E-mailed Huma, but their reply was not definitive. Sent Huma a follow up e-mail with pics to get clarification, but have not heard back

Any ideas anyone?

Here'e what the reg I received looks like. It appears to be the High power one..the bar tape show 80-150..so it isn't the 12ft/lb model.

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1595800212_4082733385f1dfa94794487.05334157.JPG

 
@Vetmx. Thank you.



@Brian

>>for the Leshiy only put 1 O-ring on the top slot. , 2 O-ring slots are for the Veles

So is the reg I have an older model or do you think it is really a Veles reg that was sold as being a Leshiy? 

Would there be alignment issues if only one o-ring is used or is the tube pressure going to make that a non-issue? 

Does the second o-ring hurt anything?