NCR

Ordered one through Amazon.com

Same here. Got a new one, unsolicited.

Pretty sure that table goes for Alpha helmets as well. I believe they are part of Gentex now.

http://www.gentexcorp.com/recommended-replacement-schedule Here's a start.

Check your Jet-A, it may already have FSII in it.

http://forums.verticalmag.com/topic/23040-helicopter-pilot-position-available-temporary/