Yes, that is a reasonable substitution.
Yes, that is a pretty good substitute.
You can substitute these tries if need be. But if you do this your car will be off balance.
yes, but your speedometer will be off by 0.7 mph at 60 mph with the 18565r15 tire. (it will read 59.3, not a noticeable error). See the link below for the details.
no
Yes, you can substitute the 205/75-15 for the 215/70-15.
No, that is a very bad substitute. If you want to go with a 70 series tire go with a 195/70-15 which is a great substitute.
Yes, they can
Yes, you can
Yes you can
Yes, they can
It is an acceptable substitute, but know that your speedometer will read 58.7 at a true 60 mph.
The rim size must match the tires unless you also change the rims to match the tires.