AA-Racks Heavy Duty Pickup Truck Ladder Rack 1000Lbs with 55'' Long Cab Ext Lumber Contractor - Black/ White (X39-LC)Each Bracket Joints connect with Four Six bolts that built upon the X 35 bars which Reinforced the bars rather than weakening them. Over Cab. Extension: 55''; Over Cab. Extension width adjustable: 45''~56. 3''. Side Bar Extension: 53. 5''~90''; Fits 5'~8' bed The extension top bars fit all the full size or semi truck beds. The adjustable range covers inner bed width from Min. 51'' Max. 71''. Product Height: 30. 5'' to the top, 28'' to the top cross