Hi guys,
A spacesaver is only ever to get you home; It is an alternative to leaving your car there, and calling recovery. If it does not rub, and is of a vaguely similar diameter, it is fine!....... Especially if you are not too lazy to put it on the back!
If it fits...... It will do!
If you want a "proper" spare, get a proper spare!...... NO size of spacesaver will do the job of a "real" wheel.!
ScotAlan