You did well to last 280,000kms on the original rear main seal - I had to replace mine at approx 80,000km on my manual Mk6 GTI.
In addition to replacing the clutch which you have the gearbox off, its probably a good idea to replace the PCV valve on top of the cam cover, as a faulty PCV can cause the rear main to blow out. (PCV) Oil Separator - Volkswagen Golf MK6 GTI - CCZB - Genuine– VAGPARTS Australia
You probably also want to check the waterpump for leaks.
As for where to get parts from, id recommend VAGParts in Sydney and/or RunAutoParts in Melbourne. VAGParts sells genuine VW parts, whereas Run Auto Parts sells high quality OEM brands like Mann/Bosch/Topran etc
As for the rear main seal, you can obviously just replace it with another genuine VW item, or iAbed and 034 Motorsports sell an upgraded design which is said to be more duarable.
iABED Billet Aluminum Rear Main Seal Upgrade '-' Pre'-'2013 VW, Audi, Skoda | AutoInstruct
034 Motorsport - Billet Aluminium Rear Main Seal - 2.0 TSI(EA888/EA888.3)– VAGPARTS Australia
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