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Jay,
I you look to e-bay and purchase a used military
helmet ( SPH-4, SPH-4B ) and plan to do the conversion yourself you'll find
the folks at www.aviationhelmets.com quite
helpful. ( Parts are much cheaper too) If I can offer any insight drop
me e-mail ( done a SPH-4B ).
Jim Kendirck, CFP
Memorial Air Angels
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