[Berkut]

http://www.srstactical.ca/communicat...et/744000.html

Something like this?

or this?

http://www.cancomradioaccessories.co...tion+earpieces

Also look into this thread - there is a lot of good advice... ifn fact both threads are identical at what you are looking for... down to the title

http://www.airsoftcanada.com/showthr...12#post1755712