71-73 trunk light question

[HHStang]

My book says I need a 631 bulb but I've looked 3 places and no one has this bulb. Is there an alternative that will work?

This is the permanent trunk light that operates on a mercury switch.

 

[Platonic Solid]

GE's site has an extremely thorough interactive automotive lamp selection guide here: GELIGHTING.COM

Mustangs Unlimited carries this lamp as their p/n: TL631

Per GEs site, input 631 in the search field and its specs are as follows:
G6 Lamp - Single Contact Bayonet (BA15s) - 14Volt. (1000 hr. Rated Life)

However, when you use the specific vehicle search feature it specifies an 89 lamp for the trunk:
G6 Lamp - Single Contact Bayonet (BA15s) - 13Volt. (750 to 1500 hr. Rated Life)

or a 97:
G6 Lamp - Single Contact Bayonet (BA15s) - 13.5Volt. (5000 hr. Rated Life)

I'd go for the 97. The 0.5V difference might have a very slight affect on lamp life, but considering the 5,000 hr. vs 1,000 hr. I'm sure you'll still come out way ahead.

 

[HHStang]

Thanks Svend! Light bulbs mean I'm close, right?