You can find all kinds of helmet parts of e-Bay or all places. And Government Sales in CT (
www.aviationhelmets.com) can sell you parts or even update your helmet for you. Nice folks.
So you can put the latest comfort padding into your older helmet.
Now what I do for comms is put a Clarity Aloft headset under my helmet. I suspect that one of the Halo headsets would work also. They are both very light and low profile. You can keep the old ear cups for noise attenuation or fill the space with pink comfort/noise attenuating foam from the drug store or Aircraft Spruce. The pink and blue foam is what is inside the aftermarket headset ear seals.
Hope this helps,
Wes
N78PS