I am getting new tires and thought about keeping the best of the old and buying a wheel from T Sportline and using as a full sized spare. However I do not think it will fit in the under space of my 2018 MX and I don't want to have to store it on the back top, premium space, while traveling. I just saw that T Sportline is offering a wheel/tire spare kit similar to Modern Spare, I think that will fit in that under space. Has anybody looked at that and what do you think? I've just never had a vehicle with a 'donut' type spare before. I have 20" tires now, I guess I don't get how one size can fit all. Thanks.