Have you seen the Motorola muffs http://www.petra.com/motorola-mhp81-...-headset.html? The cable that comes with them would probably work with your Howard Leights. The cable is probably just one of these http://www.motorola.com/Business/US-...ne-53727_US-EN with the earbud cut off and a 3.5mm jack in it's place to plug into the muffs.