After a few months I was just checking the donut air pressure ( it's in the truck I never used it) and it had a 5" blow out. anyone know why this happened? Will and tire store be able to sell me one? I'm guessing a salvage yard tire/rim will be old since it's a 2001 to 2005.
2001 buick lesabre

 

Spare tires can "age out" just like tires on the ground do. Discount Tire can get replacement spare tires. Just match the size.