Boxed Core Supports HEST TriXPoly Blend: Our proprietary blend

TriXPoly Blend: Our proprietary blend is stronger and more resilient than standard plastic or rubber

all made possible with our innovative TriXpoly material

1999-2025 GMC Sierra 1500 2WD / 4WD

Location: Rear

Boxed Core Supports HEST TriXPoly Blend: Our proprietary blendThe Dirt King boxed core supports are built to replace the stock core support and wheel well structure, making room for shock and tire clearance with long travel suspension systems. They come with adjustable tabs for easy fiberglass mounting. The Dirt King core supports fit 99 06 GM 1500s and bolt in place. Custom mounting is required for the accessories that once mounted to the factory core support. Compatibility 1999 2006 Chevy Silverado 1500 2WD