Check the listing for details. Peterbilt 579 Battery Box Upper Replacement Step - Heavy Duty 384 386 387. Condition: New. Listed at 150.00 USD. REINFORCED ALUMINUM REPLACEMENT STEP FOR PETERBILT BATTERY BOX - 30.5" **This step requires drilling through sides of existing brackets. It bolts on through end plates, not through the top.**Price is for one top (1) step, including hardware. Bottom step is available here: https://www.ebay.com/itm/192477313004Replaces top battery box step (Peterbilt part number 11-04006-0775 or 11-04537-0775)L 30-1/2" x W 7" x H 2" - Fits all 579 style battery boxes, including 567, 384, 386, 387. DOES NOT FIT 379, 388, 389, 367Made in USAReinforced with a 3/16" thick aluminum plate on the front side - greatly increases the strength and life of the stepFree shipping These are the BEST Peterbilt steps available on eBay! Why?Made in America with high-grade American metals by an American company. We are one of the ONLY sellers selling these steps on eBay that is NOT based in China.Heavy duty riveted end plates --> stronger & more durable than welded or folded ends. The end-plate brackets distribute weight along 3" on each side, and the rivets allow just enough flex to prevent cracking. Using rivets has been proven to be a superior fastening method versus welding in many industrial and automotive applications.Because our steps are bolt-on, they can quickly and cheaply be replaced if damaged again.Serrated diamond pattern provides much better grip, even when muddy and/or snowyAll steps are available with a reinforcement plate (riveted to the front edge) to further increase durability.Custom length Replacement Steps are available in our store, as well as fuel tank step kits and battery box steps. EOtruckandtrailer com