'02 300ec calliper seals

[Bones1999]

Hi all
As of Friday last week I'm a new GasGas rider. The bike I've got is a 2002 300ec and in need of some TLC. It hasn't done huge hours but the standing in a shed has taken its toll. I need front and rear seals for the Nissin callipers and was hoping there was something Japanese available (only reason is that there is a 4 week waiting period for genuine GG seals). They look very similar to yamaha or suzuki callipers?? Was also wondering what the difference is between the '02 and '03 as I need a new exhaust and would like plastics for it and there is a large listing for the '03s but not '02s???
Thanks in advance
Rob