At Tyres.co.uk for a Ford Focus CC, the Michelin Primacy 5 and the Bridgestone Turanza 6 are available in the size 205/50 R17 93W XL for the 2008 Focus CC CC-2 with 17-inch factory wheels. Please check the registration and tyre-pressure sticker specifications before purchasing, as Focus CC variants have different wheel options.
Tyre size information for Ford Focus CC can be found on the sidewall of each tyre. Decals showing approved tyre size and tyre pressure are located on the B-Pillar of the driver's door. With changed wheels, check this decal and the owner's manual against the registration.
Since all Ford Focus CC models are front-wheel drive, there won't be any drivetrain versions that require all four tyres to be replaced as a set. When replacing tyres, do so in pairs on the same axle, using tyres of the same specifications. Additionally, if you are putting new tyres on one axle, the new ones should be on the rear axle as this will improve stability on wet roads.