I'm sorry, I'm at a loss. The bike came with a Tange Falcon headset and it is shot.
I've been looking and concluded the Levin is the best replacement headset as far as cost and stack height.
I measured the OD of the area where the crown race is pressed onto the steerer tube and it is a 27mm.
I know it is an interference fit, but what is the correct headset size: 26.4mm or a 27mm? All I've come across is the 26.4mm flavor.
S Brown's site didn't help much as I'm not sure if the bike qualifies as JIS or ISO.
http://www.sheldonbrown.com/cribsheet-headsets.html
best
Steve