I know the first generation Rio's had a 4x100 bolt pattern. That's what your looking for. There's also the offset and centerbore.
4x100 means 4 holes for bolts which are spaced 100mm apart, and most rims with this bolt pattern will bolt up to your hubs unless the centerbore size is smaller. If it's bigger it's not a big deal, you can get hubcentric rings to correct it if your lug nuts/bolts aren't tapered or acorn style to center the rims on the hub.
Google offset/centerbore/wheel spacer/hubcentric ring/acorn style-60 degree taper (lug bolts/nut shape) and when you figure out what these words mean you'll know enough to choose your own wheels.
If you go with a different size wheel and need new tires, this site has a nice tire size calculator you can use to determine what size tires you need to keep the speedometer right. You can compare up to 5 different tire sizes at a time!
Tire Size Calculator - tire & wheel plus sizing