It should be mounted up under the back of the bed.
I'm semi-sure it's called a spare tire carrier.
Notice the small hole below the tail gate but above the license plate. Insert the jack handle into that hole and turn the handle counterclockwise. The spare tire will lower down to the ground.
The best place to get Chevy S10 parts is the dealer that sells Chevy cars, they have a spare parts departments that provide all Chevy parts, also Canadian tire should also carry all parts for all cars. Hope this helps.
235x70x15 this tire size on my 2001 s10 blazer
You can purchase a used one from your local salvage yard. This would be easier than building one.
near the spare tire
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On the frame rail in front of the spare tire.
75r15 Is the tire size of the blazer S10
The tire will have that information printed on it.
A 98 Blazer S10 has 5 lugs on each wheel.