I was going to bid but I already have an extra one of these.
It's for the 8" RCA Personal Portables.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=360168804484

Rare item, but not sure if they're worth buying... I've never seen a bad one yet.

Charles