ECOTRIC Rocker Panels & Cab Corners for 1999–2007 Chevy Silverado / GMC Sierra 4-Door Extended Cab — 2-Pack, Galvanized Steel

ECOTRIC's slip-on outer rocker panels and cab corners replace rusted lower body sections on 1999–2007 Chevy Silverado and GMC Sierra 4-door extended cab trucks, restoring structure and curb appeal.

If your extended-cab Silverado or Sierra shows corrosion, denting, or missing lower trim around the doors and cab corners, these direct-replacement steel assemblies are designed to bring the truck back to a finished, protected look. Sold as two packages (each containing left and right outer rocker panels plus cab corners), the parts are engineered for slip-on installation without cutting or major modification. Galvanized and electrophoresis-coated surfaces resist everyday wear while reinforcing the lower body against chips and impact damage.

Will these rocker panels and cab corners fit my truck model?

These replacement pieces target a specific range of GM models and years; confirm your year and cab type before purchasing. They are built for 4-door extended cab trucks and replace several OEM part numbers used on classic Silverado and Sierra models.

• Compatible with 1999–2006 Chevrolet/GMC Silverado and Sierra 1500.
• Compatible with 2000–2004 Chevrolet/GMC Silverado and Sierra 2500.
• Compatible with 2001–2006 Chevrolet/GMC Silverado and Sierra 2500 HD and 3500.
• Compatible with 2007 Chevrolet/GMC Silverado and Sierra 1500/2500 HD/3500 Classic.
• Only fits 4-door extended cab body style; replaces OEM 0856-001, 0856-002, 0856-115, 0856-116.

How difficult is installation and what hardware is required?

Installation is intended to be straightforward thanks to the slip-on design: the rocker panels and cab corners slide into place without cutting or reshaping the outer body. Mounting hardware is not included, so plan to source bolts, clips, or rivets that match your truck's original fasteners for secure attachment.

• Slip-on fit means no drilling or major body modification required.
• Mounting hardware must be purchased separately to match factory attachment points.
• Basic hand tools and, optionally, a helping hand or jack stands recommended for alignment.
• Surface prep (cleaning and rust inhibitor) improves longevity before installation.

What are the materials and durability features?

These replacement panels are fabricated from durable steel and finished to resist corrosion in everyday use. The combination of galvanization and electrophoretic coating helps protect the surface from chips, moisture, and salt, extending the life of the repair compared with untreated sheet metal.

• Heavy-gauge steel offers structural reinforcement to the lower body area.
• Galvanized surface reduces rust development under typical road conditions.
• Electrophoresis coating provides an even protective film for longer service life.
• Designed to hide unsightly damage and restore a clean outer profile.

What comes in the box and what should I prepare for installation?

The set ships as two packages covering both sides of the truck: each pack includes an outer rocker panel and a matching cab corner for left and right installation. Hardware is excluded, so gather fasteners and any seam sealer you prefer ahead of time.

• Includes: 2 × outer rocker panels and 2 × cab corners (left and right overall).
• Mounting hardware and finish paint are not included.
• Recommended prep: remove rust, clean surfaces, use rust inhibitor, and align panels before fastening.
• Finish with paint or undercoating to match your truck after installation.

Who is this for: These replacement rocker panels and cab corners are for owners of 1999–2007 Chevy Silverado or GMC Sierra extended-cab trucks who want a cost-effective way to repair lower-body rust, restore factory appearance, and reinforce the cab underside. They suit DIY mechanics with basic tools as well as professional body shops restoring classic GM pickups that require direct-replacement components without body modification.