Biggest tires and wheel that will fit on a 97 chevy silverado 1500?

[hello15]

I Think it has 15in on there now. I want to get some oem rims that have come off a newer Chevy. What is biggest size wheels and tires I can fit? would a stock 09 silverado fit?
It is not lifted. Just stock

 

[dougrosedougrose]

without lifting it i would say a 18 inch wheel set but any good tire and wheel shop can tell you