High Density, Cross-Linking Polyethylene Targeted thickness 1/4" for superior strength Our MTS Company #2808 55-gal. fuel tank replaces the 2006-2016 Chevy/GMC Express/Savanna 2500, 3500 and 4500 Cutaway Van with a rear/aft axle tank. This tank is for the Gas engine setup ONLY. Approx. dimensions 39 5/8" x 33" x 12 3/4". The use of the four black metal spacers (OEM# 20969742), bolts (OEM # 11519831), plug and threaded tube from the original tank are required for installation. Do NOT use the OEM sending unit gasket. Tank includes our specifically designed sending unit gasket & steel retaining rings for the sending unit and EVAP valves. Replaces # 19210021, 37183472. This tank does NOT include a sending unit, valves, valve gasket(s), mounting straps or mounting spacers.