The lug pattern is 8 on 6. 5. The width is 6. 5, but I assume you will want to go wider. And the stock offset is 4. 75". IMO try to stay with the 4. 75" offset, or very close to it. If you go with less of an offset, the tires will stick out from the body more, especially with wider wheels, and there will be an increase in stress on the suspension components (more so than with just larger/wider tires and wheels)
My $. 02,
Ryan