stock tire size with the Boleros was either 245/45 (on EVO models) or 245/40 when you opted for the wheels on regular models. I`d go for one of those sizes. No hassle with paperwork and authorities, looks good and no clearance issues.
The wheels are 8" wide, and you could put anything from 225s to 255s on them safely. Depending on where you live, you'll need to check with your local licensing authorities about what will be acceptable, though....