light bulb under the hood

Can anyone please provide me with a picture or type number of the light bulb under the hood? The owners manual just says '10 watt' but evidently a standard 10 watt tube bulb doesn't fit...

Does it look like this?
http://i33.tinypic.com/rthtfo.jpg
If so, it is a 1003

Unfortunately, there wasn't a bulb in it when I got the car.
It looks like it needs some kind of tube light like this:
http://www.hobby-rama.nl/lampen/images/LAMP%20416.JPG

The standard 10w tube light is too small.

Hmm. Your profile says your PA is a '91 and that's supposed to be the bulb. The '92 used a 561, and here's a photo of one:
http://i37.tinypic.com/14neblc.jpg

I couldn't find a 561 to try, but I see it is about the same length as the other bulb which seems a bit too short.

Here is a picture of the light with a 10w tube bulb in it for comparison, it looks like it fits but this is an illusion, the tiniest movement will make it fall out.

http://www.uploadgeek.com/uploads456/0/30102008.jpg (http://www.uploadgeek.com)

The 561 will hook onto the end terminals and not fall out.

I got a new 561 bulb, but it still doesn't work. When and how does this light go on, I don't see a switch as with the trunk light?

Should be a mercury switch in the base of the light- you can't see it- and oh- BY THE WAY turn on your parking lights- Buicks tend to think you only need the light when the lights are on....and the hood is up...as I recall...

Thanks for your reply, I tried it with the parking lights on but it still doesn't work. I take it the problem would likely be this mercury switch then?

Do you have power (12v) to the mercury switch?