The 12 small belly lights - Sockets, bulbs & lens.

You can visit Allied Electronics, Inc at:  or call them.  They'll send a nice catalog.
 

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  $4.29 each)

T-3 1/4 Miniature Bayonet Lamps #755 (Allied Stock No. 937-7355 $7.56/pk of 10)