What engines does this kit fit?

It is listed for various VAG 1.4 TSI and TFSI engines under OEM part 03C198229C. Match your engine code against the part number before buying, since not every 1.4 TSI uses this set.

Is this the updated design that fixes the chain problems?

Yes. It is described as a modification set for the known chain problems, so it uses the revised parts rather than the early design.

Timing chain, chain tensioner, two chain guides, camshaft sprocket, camshaft adjuster, crankshaft sprocket, front cover gasket, crank seal, two cover O-rings and a crankshaft bolt.

Do I need special tools to fit it?

Yes. Setting the timing on these engines needs the correct locking and timing tools, and the job is best left to a shop familiar with VAG 1.4 TSI engines.

Should I replace the water pump at the same time?

On these engines the water pump is driven separately, so it is not part of this kit. Many owners replace it during the same teardown to avoid a second strip-down later.