Well sorry to hear that, bloody hell when it rains it pours as they say. Your insurance covers you for "accidents" not mechanical breakdowns, never has and never will I'm afraid. Your best bet is to use the net to find the parts yourself and even fit them cos half or more of that bill you got was labour. Look on EBAY and GUMTREE to see if their are any bikes like yours for sale that you can cannibalise or just look for the parts you need rather than a whole bike, would work out much cheaper than buying new from Yamaha, just as an aside I have just replaced the plastic retainers that hold the panels on my bike, Yamaha price is £6 each my local car factors I got 10 for a pound, exact same thing!