Civics don't use 13mm for anything that I know of. The standard hex head size for M8 fasteners on Japanese cars is 12mm. So pick up some 12mm stuff for working on your Civic. (For M6 fasteners, it's 10mm, just like on older German cars.)
I don't remember what the larger sizes use off the top of my head, though. I do know that some newer cars are using 18mm for some fasteners. That made me grumpy when I found that on my wife's car's brakes... I didn't have any 18s and had to run out and get one.
-soD
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