I took the bulbs out of my 5th gen civic cluster (made in canada).
i then took a micrometer to the bulb and did some measuring.
the #74 bulbs you see at autozone, oriely's and there rest are SAE #74. Their exists an E #74 (e74) which is a european measured bulb. the difference is that the SAE #74 are 4.9mm wide at the base and the e74 are 4.6mm wide at the base... makes a big difference.
Specificly the american 74s
T1.5 w2.1x4.9d bulbs
the european measured 74s are
T1.5 w2.1(or2.0) x4.6d bulbs
if your looking for replacement bulbs overseas look for T5 w2.1(or2.0) x4.6d.
The difference? in america we the 1.5 is 1.5x(1/8 inches) the rest of the world is metric..so the T5 is 5mm.
The number after the T is the width of the bulb at the round part.
here is a good diagram of the e74.
http://www.donsbulbs.com/cgi-bin/r/b.pl/e74.html and if you are looking for a specific part number for e74s
http://www.eiko-ltd.com/Products.aspx?CatID=459&ProductIndex=E74
Oh, the bulbs in my civic are e74s.