SR3 emitter, o-rings, and switches?

I got a Nitecore SR3 that didn't include an extra switch or even appropriately sized o-rings. For now I am using red silicone ones I had left over from a Jet III M. I would prefer something like Viton or other high quality non-buna o-rings. Anyone know what size and a good source? How about a source for an extra switch?

Also, the tint would indicate a Q5 emitter, and the included instructions say 220 is max output...is there any way to tell by serial or other which emitter I have for sure?

That's strange. Mine came with an extra switch and Orings but no switch boot. Looks like you might have gotten one that they missed out on the spares. Can try to contact your distributor or Nitecore on the spares. I guess a 20mm O ring will suffice cos the tube is 22mm.

http://www.nitecore.com/ContactUs/index.aspx

Not sure about the serial thing, but there isn't any newer version in my radar. Was there a emitter update?