How much additional tire clearance do these flares provide?

Fuji-style flares extend the body line outward to accommodate moderately wider tire-and-wheel packages than the factory fender allows. Measure your current setup and desired wheel width; compare against the installed flare profile to confirm clearance for your specific combination. A test fit before final fastening is recommended.

Do I need to drill holes to install these, or do they use existing factory mounting points?

These flares are engineered to bolt to existing factory attachment locations on the rear quarters. Drilling is not required; you'll use the original body holes. Verify your vehicle's specific fastener layout in your service manual before assembly to ensure proper alignment.

What wheel sizes and offsets work with these flares?

Compatibility depends on your tire diameter and wheel offset. The flares extend the usable wheel well envelope, but you must verify fitment against your chosen wheel and tire combination. Consult your wheel supplier's offset recommendations and test-fit the assembly before final installation to confirm your specific setup clears the flare edge.