Not sure how things stand regarding insurance fitting non manufactures space saving wheels, fortunately our Suzuki Across came with alloy space saver.
Our previous Mobility Mitsubishi Outlander PHEV came with the jack and wheel brace but no space saver, as we tow a caravan we purchased a genuine Mitsubishi wheel and tyre.
Unfortunately I have suffered a brain injury and occasionally I get confused and often say the wrong thing.