Therefore, no spare is included. That way, you have to go to a dealer after you get a flat and:
1. Be told that the run-flats can't be remounted because of stress and fatigue
2. Wait for him to order the unique size
3. Have it installed there
4. Pay a serious amount of money
5. Have limited choice of replacements in your car's size
6. Out up with just another electronic gadget in your car, the mandated tire-pressure monitoring system. I suppose this is required because of the morons who would drive the car indefinitely on tires without air because they thought their tires were intended to do that.

Will the full-size 15-inch wheel fit, but only some of the 16 inch ones, depending on which tire is mounted?

I have an S70 ('98) and the full size spare (205/55/16) I put on another Perfo wheel to match my other wheels ALMOST fits in my spare wheel well. I still make it work although it lifts the trunk floor about an inch. Still, much better than a donut tire. At least this way I don't have to worry about a flat tire miles from home on a Sunday afternoon (which happened once several years ago in our 850- that was what prompted me to promptly change the donut out to a real tire when I bought this S70).
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1998 S70 T5 Emarald Green Metallic (125K), 2004 V70 2.5T Ruby Red (45K), Previous Owner of Black '94 850 Turbo Wagon (Sold at 140K and miss her). My cars have been running so well lately they've got me worried.