First, I'd like to apologize if this is in the wrong forum.

Anyway, I'll make this short N' sweet.

I'm in desperate need of changing the dome light bulb (the light right on top of the roof, inside wise, of course) and I've got no idea on what the size of it is.

I need it to be a bright white HID like bulb.

I looked around and one no-name website said it was 30mm and I'd like not to order one and waste pointless money.

tl;dr
Need a dome light size for my 1998 Honda Civic Coupe, what is the size? And where am I able to order an HID bulb?

 

the width of the end that plugs into the socket is 10mm. 5W