#1. Having a "blowout" at highway speeds almost always severely damages the opposing tire. It could last a few months but should be inspected for internal damage.
#2. The Carlisle CSL is a steel cased tire. Tires on the same axle should always be of the same size and design. Is the Rainier also steel cased.
#3. I would not risk using that spare. Take it to a tire shop for assessment is my recommendation.
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