I'd say 33 x12.5. Last time I got 32's, they were 11.5 instead of the 12.5's so they would be narrower on the wheel....just hard to tell.
In any case, I'd go with a 33x12.5 on stock rims or 15x9. In my opinion, stay away from 10" wide rims for the 33's. They just stick out too far and don't look right to me. Too much rim showing and potential to rub the wheels on curbs/rocks etc.
Try the 33's at stock. If they don't work, get an add-a-leaf in front and a short block in back.