Zenith Trans-Oceanic Royal "3000"

I'm looking for replacement bulbs for the band scale illumination on the
above listed shortwave receiver. The bulb is an older screw-in type that is
powered by a single "D"-Cell battery. I've looked high and low for a
single-cell (1.5V) bulb, but have come up empty handed. The only thing I
have found in the 1.5V category is the "spot" style bulb, which would be
useless in this application.

Anybody else have one of these units that has found replacement bulbs?
Perhaps you made a slight modification to the unit and somehow arranged
something using LEDs? Any advice or thoughts on the matter would be greatly
appreciated.

Details: The bulbs looks like the one pictured he
http://www.topbulb.com/images/bulbs/50.jpg
According to the sight is a "G"-type bulb, although another sight identified
it as an "E"-type? Bulb is 1.5V (or thereabouts), and has "123" printed on
the side, and "*** USA ***" is stamped into the side of the bulb base.

Thanks!