Do I need to fabricate custom mounting brackets?

Yes. This wing does not come with pre-drilled holes or mounting hardware. You'll need to fabricate brackets that match your vehicle's rear deck geometry and attach them to solid mounting points on your trunk lid or body panel. Measure twice before drilling.

What's the mounting hole pattern on the wing base?

The raw assembly does not come pre-drilled. You'll determine the hole pattern based on your custom bracket design and your vehicle's available mounting real estate. Verify clearance between the wing assembly and your trunk lid or spoiler when both are closed before finalizing bracket location.

Will this wing stay stable at highway speeds?

FRP wings are rigid and lightweight, so stability depends entirely on bracket construction and fastener quality. Use solid mounting points, torque all fasteners securely, and ensure your brackets are braced and triangulated to resist flex. A well-fabricated, well-fastened mount will handle highway speeds with no issues.