Just a thought - especially if you want to save your hearing, be able to hear an intercom, yada, blah, whatever...
Get in touch with PCI Race Radios
http://www.pciraceradios.com/ and have them make you a set of molded ear plugs that can attach to your setup. Tell them what you have and such and I bet they can get you styling.
For the molded plugs, go to a local Sears (Miracle Ear is inside some Sear stores) and have them do a silicon plug of your ear canal. Send the plugs to PCI and let them do their magic. PCI will send you back a set of ear plugs that are pre-wired and have a 1/8" male mono plug on them along the molds you sent them.
I've run the plugs for the past few years in the Dez and can't be happier. QUIET, protective and they fit all day long w/o any irritation.
The advantage is that it gives you a quiet setting, so you can turn down the intercom system and get a clearer setup.