Will a 16-inch rim space saver wheel be acceptable on my car with 17-inch wheels?

Will a 16-inch rim space saver be acceptable on my Mazda MX5 with 17-inch wheels?

My space saver spare wheel is only 16 inches but my wheels are 18 inches - is it safe to use on the driven wheels?

I have a Mini Clubman which has 18 inch alloys with low profile tyres. I have purchased a 16 inch space saver which I have been assured is suitable for use in case of emergency, even though the total diameter...

Is it safe to have a spacesaver wheel that's a different size?

I need to get a space saver wheel for my SEAT Arona SE Technology that has 17-inch wheel but I can only find 18-inch wheels. Would that be ok?

Will fitting a space saver spare wheel affect my warranty and insurance?

I will shortly be taking delivery of a Toyota Yaris Cross Design with 17-inch wheels.This vehicle does not come with a standard space saver wheel and one is not available as an option or as Toyota accessory...