Minor correction to the following:
Instrument light
..........We were missing several from our Westy when we bought it.  To my
knowledge,
the only place to get them is at the "Dreaded Dealership".

That is strictly true, but you can get a very close approximation from your
FLAPS.  Just take a chisel-ended Xacto knife and remove two small ridges in
the plastic sockets... and you will have a very economical replacement.
Take a dead bulb with you and they should be able to fix you right up.....
Our Easton [Md] Carquest calls them CLB-37 and the net price  ~Aug 99 was 55
cents each.