Overhaul kits should be readily available from any transmission parts supplier. Why does the K2 drum need replacing? If it's due to an internal leak at the rear of the drum, that can be repaired with parts supplied with the rebuild kit. The symptom with that problem will be either no fourth gear or it will drop out of fourth. What you'll end up doing is drilling out three rivets then tapping the holes to receive machine screws. This will allow you to replace the leaking O-ring that normally would require replacing the K2 drum assembly. Bands (if they're actually needed) you should be able to get from the same place that you get the overhaul kit. Make sure to get the overhaul kit that has at least the new clutch friction discs included. Last one I did had a "Precision" brand kit with the repair kits for the K1 and K2 O-rings.

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Erich Loepke
2010 Ford Focus
Currently Benz-less