Your best bet would be to buy a David Clarke headset with the helicopter lead and then buying a GA splitter lead. Why? because the only difference is that the helicopter one has the curly lead reducing the chances of it getting caught up in the cockpit, it also has the nato single plug on the end of it so you just plug the splitter on the end and it then has the two GA leads coming off it. The other way around you will get a loop that will catch. Helo lead option is always a bit more money but worth it. David Clarke is a well known brand with easy access to spares and over the years I have seen SLC come up with all sorts of interesting ways to try to destroy them. Again as others have said don't buy cheap.. Look out for a second hand one in 'new condition' around flying schools or ebaymotors.com in the aviation accessories section.