Where can I buy a new ignition switch to replace the ignition on a stolen/revcovered VTR 2003?

Normally you can't because the ignition is electronic and has an immobilizer.

Just buy a new switch or you will have it stolen again.

https://www.google.com/search?q=kawasaki+ex250+replacement+ignition+switch

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Unfortunately this is going to be an expensive fix. Most modern cars have electronics inside the key which communicates with the immobiliser system in the vehicle. This is what the 'Key Number' is for. It is specific to only your car as it is there to prevent the car being stolen.
You will need to replace the entire ignition barrel and contact a Mitsubishi dealer with your details to get the Key Number for your car. You will then need to buy new keys and have them coded to your car's immobiliser system using the Key Number.

make sure all damage was repaired -and that new ignition system is flashed to the vehicle

power steering pumps ,electric ? i have swopped bits over between these units before now with varying degrees of sucess ,even the renault uses the same pump but all i can advise is strip the unit and see ?? as for the wiring then anything is possible but these cars and a few others do suffer with the ignition switch which is made by clauser ,Just buy anbother one 194 euros as a complete kit with the door locks and fuel cap as this kit is cheaper in the dealers than a individuel item ,dont forget to change the chip out of the old key for the new key

get a pineapple slice it up,pour malibu over it in a glass with ice and enjoy. dave

most Gm use a chip in the keys. the doors with be easy to ,but the ignition will not. you will need to go to the dealership and have them remove the lock from the ignition and re program the new key

Could you have left the ignition switched on? Recharge the battery, refit it, with the ignition switched off,
connect the poss feed first, secondly as you replace the earth wire, if you get any level of spark as you touch the earth to the battery, then you have a voltage drain, this could be a result of external accessorze like an allarm, to a faulty rectifier, if you have no spark then there is no drain and you would have to question the integrity of the battery,

You have changed a component that needs to be recognized by the ECU otherwise the ECU tells the immobilizer that there is a temper with ignition wires and car will not start as it thinks it is being stolen. Get the car to a garage to reprogram the ECU to recognize the new ignition.