Ok, I retract my previous statement about the vanity bulb. It is not a 74. Looking at it quickly, it appears to be but compare the vanity bulb and gauge bulb (74) side by side, it's obvious they are not.
Here is a picture:
The vanity bulb is tiny bit shorter, and has a slightly smaller base. So it's larger than the clock, but smaller than the gauge bulb.
Also, Sylvania is wrong about the "instrument" bulbs. The only 161 bulbs are in the HVAC panel.