jasonc yeah I try to get the same tires that the vehicle requires. Yeah and pretty much if you got a nail in your run flats you have to drive directly to a tire shop, another reason I don't like the donut spares.
Yeah my rims are chromes and my spare is a steel rim, but it works perfectly fine as a regular wheel if I need to use it. Had it on all summer when I found a nail in one of my tires, kept losing air on it. Still had lost too much air in it, needed resealing, bead wasn't secure after losing air pressure.
Had to finally take the steel spare off to do a proper tire rotation with my replacement tire due to another tire that had a blow out. Mechanic thought something hit the sidewall.