Demco Base Rails Under Box UM401001 (8551004)
This Demco UM401001 (8551004) Base Rails Under Box UM401001 is designed for easy installation and secure mounting of underbox bed rails, providing a reliable foundation for your truck bed accessories.
Compatible with:
- 99-07 Chevy Silverado/GMC Sierra 1500/2500 (6.5′ & 8′ Bed)
- 01-07 Chevy Silverado 1500HD (6.5′ & 8′ Box)
- 01-09 Chevy Silverado 2500/3500HD (6.5′ & 8′ Box) Includes New Body Style
The UM401001 Base Rails Under Box comes with:
- 2 Base Rails (Part # UM401001B)
- 2 Frame Bracket Plates (Part # UM401001A)
- 4 1/8″ Shims (Part # UM406C)
- 8 1/2″ x 1 1/2″ Bolts (Part # 104)
- 8 1/2″ Flat Washers (Part # 105)
- 8 1/2″ Lock Nuts (Part # 106)
- 4 5/8″ x 1-1/2″ Bolts (Part # UM416)
- 4 5/8″ Flat Washers (Part # 418)
- 4 5/8″ Lock Nuts (Part # 417)
- 4 Bed Plugs (Part # UM407)
Ensure a solid and stable base for your truck bed accessories with Demco Base Rails Under Box UM401001 (8551004).
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