'96 A4 Instrument cluster light bulb

How can I find out what type the light bulbs in the instrument cluster are and where to get them. They are way to expensive at the dealer. What is the technical description? Could it be T1.5 or #74?
It would be great if the one below fits. Has anyone tried to use LED replacements in the instrument cluster? http://www.superbrightleds.com/specs/74_t15.htm
Jone Tytlandsvik
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