You can visit Allied Electronics, Inc at:  or call them at 1-800-433-5700.  They sent me a nice catalog.
 

Dome Color	Part Number	Allied Stock Number	Price Each
Transparent Red	30110	937-6225	$0.42
Transparent Amber	30111	937-6221	$0.55
Transparent Green	30112	937-6224	$0.55
Transparent Blue	30113	937-6222	$0.59
Transparent Yellow	30114	937-6227	$0.55
Transparent Clear	30116	937-6223	$0.55
Translucent Yellow	30131	937-6237	$0.43

I ordered 3 of each of the six transparent lens type (18 total, so I can mix and match as desired).
I ordered 1 of the translucent yellow lens for the programming bay.
I ordered 2 packs of the lamps.  These are cheap, but don't flash.  I plan to have all computer controlled lights anyways.

I ordered 13 of the bases (12 for the belly lights and one for the programming  area).
  Pilot Bases #31099 (Allied Stock No. 937-6154  $3.54 each)

T-3 1/4 Miniature Bayonet Lamps #755 (Allied Stock No. 937-7355 $3.67/pk of 10)