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The stock wheels are 15 x 6 inches so you are quite limited on tire choices unless you go to a larger wheel such as a 17 x 8 inch.
With the 15 x 6 inch wheels the best option is 225 - 60 -15 but this will give you a slightly lower rolling diameter than the original stock tires at 205 70 15. The 225 is a good width for that car though and 225 60 15 is an approved size on a 6 inch wheel.
Most any GM 3.1 should interchange, You might try going to www.car-part.com and search for your application. They have a built in Hollander interchange that will offer any interchangeable part for your application.
If you have the standard factory 15 inch (diameter) x 6.0 inch (wide) wheels then the tires fitted were size: 205/70R15 (205 is the tyre width in mm and the 15 denotes the tyre bead diameter in inches for fitting to 15 inch wheels. The R denotes the speed rating of the tire).
The tires currently fitted to the car have the size moulded into the sidewall of the tire.
However I do not know if aftermarket wheels have been put on the car and if so a different size tire from the standard factory fitment may have been fitted to the wheels.