Interesting post. Four years later I've come up against the same problem trying to buy front discs online for my 2006 Focus Ghia 1.6 VVTi petrol 115ps with 16" wheels. Eurocarparts offer both the 278mm and 300mm diameter front discs for my car. I measured the disc like you did and got close to 278mm. A bit less actually because the outside edge of the disc was badly corroded. I also noted that there is insufficient clearance between the rim of the disc and the caliper carrier bracket for a 300mm diameter disc. Therefore for my car with a 16" wheel it's definitely the 278mm disc.
Edited by IKM on 16/06/2013 at 20:33
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