Light Bulb Identifacation

[cherokeejohn]

hello all. I have a simple question to ask. I am try'ing to identify to replace the interior light bulbs that light up the A/C , Heater controls, I have removed them, inspected them (even with a magnification lens and can not see or find any ID numbers or letters, nothing. They are not the 194s like the back of the gauges, they are a small round bulb, single contact and the locking tabs are at 12 and 6 o'clock, or exact opposite from each other. the onlt markings on either bulb says USA. ??? is anyone familiar with theese bulbs???