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From the TM, it looks like that is a standard automotive 168 bulb.
W5 W5W W
W2.1×9.5d
1
6 V, 12 V, 24 V: 5 W
ECE nominal luminous flux: 50 lm ±20% T10 size
Old designation: W10/5 ANSI № 168
Info from the internet:
W5W Bulb Equivalents
The W5W has many crossover equivalents including...