1981-1986 GMC C10 K10 C/K 13" Polished Billet Aluminum Radiator Coolant Overflow Puke Tank, Squarebody C15 C25 C35 K15 K25 K35The Zirgo Standard Overflow Tank Is A Functional Treat For The Eyes! This reservoir is for your 1981 1986 GMC C10 K10 C K and mounts anywhere in your engine bay using beautifully crafted adjustable billet tank mounts. No need to drill holes or perform unnecessary fabrication to mount this tank, just adjust the clamping bracket and secure in seconds! Zirgo's unique internal adjustable overflow system eliminates the unsightly overflow tube from the top