Barricade Hd Roof Rack Full Length Extension Kit Designed For Barricade Hd Hard Top Roof Rack J142019-Jl Only Rugged Steel Construction Textured Black Powder Coat Finish Simple Bolt-On Design Increased Functionality. Upgrade the functionality of your Barricade HDX Hard Top Roof Rack (part number J142019-JL) with this Barricade HD Roof Rack Full Length Extension Kit. Barricade designed their HD Roof Rack Full Length Extension Kit to be a straight forward, bolt-on upgrade for use with their HDX Hard Top Roof Rack. Steel Construction. Barricade manufactures their HD Roof Rack Full Length Extension Kit to precise specifications from heavy duty steel for superior strength and durability. Barricade then completes it in a two-stage, textured, black powder coat finish for long lasting corrosion resistance and rugged good looks.Application. This Barricade HD Roof Rack Full Length Extension Kit is designed to fit 2018-2023 Wrangler JL models with the Barricade HDX Hard Top Roof Rack (J142019-JL) installed. Not compatible with other brands of Roof Racks.