Are you sure they are LED's? LED have a very long lifespan and I think incandescent bulbs were used in the amps a while back which of course, Dont have nearly as long a lifespan as an LED. Anyhow Here is the part number for the blue diffused LED's I bought to replace the stock ones on my khartago's The stock were just too bright for when I like to listen at night. These are about a third the brightness but still plenty bright and also they have a more deeper blue color which looks more relaxing

604-WP7104MBD
Got them from mouser. When your looking at the led, You can see that one lead is attached to a side thats bigger than the other (this is inside the led) that is your negative.
Also, Im sure Klaus can help you out too The diffused LED's that I bought might not work as well for the Stratos since the way they are used is different and you may want the super bright for that. The Odyssey Logo on my Tempest is not too bright at all and I would imagine it uses the same bright ones that were in my Khartago's