He's right. You'll need to know the actuall width of the tires you plan to use and the backspace and width of the rims you plan to use if other than stock. My 10 inch american racing baja's and 35X12. 5R16. 5 BFG MT's rub the inner fenders even with DT long arms. MANY people run the metric equivalent on their stock 16's and never rub, some even without new links and the level kit only.
Good luck. You'll be happy i'm sure.