If you have any receipts for the extra's, take a photo copy and send them with a covering letter claiming for the loss. If you have any other receipts, tyres, servicing etc I'd send a copy, it shows the car has been well maintained, I think you can also claim for the loss of any damaged items of your wifes, such as CD's etc.
Best of luck with the claim, as Will says, get some adverts, try the Main Toyota garage near you, they normally will have a web page, you can get some idea of the current going rate for your car.
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