Bulbs by John Joyce (as posted to 1st-gen Yahoo group 12/5/06

RS part numbers for indicator lamp bulbs etc.

Bulb (30V 2W MBC): 193-5008 (£4.40 for 10)
Bulb fitting tool: 339-2706 (£0.70 for 5)
Blue panel indicator fitting (air&axle / engine lights): 589-991 (£2.65)
Blue panel indicator fitting (heater panels, head/tail, main switch
indicator, etc): 589-890 (£1.69)
Bayonet cap bulbholder for both of above: 589-783 (£3.83 for 5)

Note most existing fittings take bayonet cap bulbs (MBC) but some take
screw cap bulbs (MES). Also, you need indicator fitting + bulbholder +
bulb if you're using the part numbers above.

Also of potential interest:
Buzzer push button switch (also heater panel 'start' button): 103-6280
(£1.45)
'Test' button: Farnell p/n 422241 (£4.98) (RS don't seem to do it)
Toggle switches are cheaper from Maplin or Rapid.