[ARC5] Light Bulb for LM Power Supply -- source?

[Tom Bridgers]

I thought I had a source for the light bulb that fits my "on" indicator for 
my LM Power Supply.  It appeared to be a 6S6/130, and so I purchased a 
couple.  Unfortunately it comes close to fitting, but the bulb's neck is a 
tad too large.  The 6S6 will not screw down all the way.

So was wondering if any one of you might have a source for said light bulb? 
Or if not that, what work-arounds do you recommend?

Thanks in advance,
-Tom  KE4RHH