Not sure about SRX's, but most XBR bits are available from either David Silver spares(Genuine) or WEmoto (Good patterns), also loads of bits on Ebay. The only hard bits are rear wheels that haven't got oval drums and full exhaust systems ( dave silver did have genuine ones but I understand he's now sold out). WEmoto are probably good for most SRX consumables as well. Certainly XBR's are generally pretty reliable transport and fairly easy on chain's, tyres etc. If you get an XBR make sure the back brake doesn't pulse under braking and that the front down pipes are in reasonable nick ( you can always stick a pattern silencer on if the downpipes are OK).