The Suzuki Vitara was available from the factory with 215/60R16 tyres on 6.5x16-inch alloy wheels, so this is a swap you should be able to make without any issues. Whether you need to inform your insurance company is something of a grey area - if you fit original equipment 16-inch alloy wheels then arguably this would not be required as this is a specification which the vehicle could have from new, but if you fit aftermarket alloy wheels then this would be considered a modification and would require your insurer to be notified. We would recommend checking the terms and conditions of your policy and contacting your insurer directly if you are in any doubt.