You want to be careful. Someone replaced the bulbs in my M923 with something nonstandard (not per the TM) and they melted the plastic covers. It was a MESS to disassemble them and fix (cover melted into socket) - had to replace two of the sockets. Plus, I had to find the correct covers (mine were green) and they were hard to find in the long configuration. This is another story - the military covers are in two lengths and in many different colors (red, green, blue, clear, ...?). Find the long, clear covers if you want a brighter dash, but they are hard to find too. The short, clear covers seem to be readily available, but then you need to change out the mounting brackets on the sockets.
Al Jones
'84 M923