airfilter, oilfilter and fork seals are the same as the twinshock SRX600

you can try 'Busters' or a yamaha dealer
yahaha part nos are fork seals 49a-23145-00-00
you'll need a circlip, usually corrode 4a1-23156-00-00
air filter 1jk-14451-01-00
oil filter 4x7-13440-90-00
these are from my SRX600 1JK series microfiche the numbers may be superceded but a yamaha dealer will be able to transpose them ok
You can get the oilfilter from halfords and i use their semisynthetic motorcycle oil