1921-1925 Yellow Cab Model O-5 13" Polished Billet Aluminum Radiator Coolant Overflow Puke Tank, Model O-5The Zirgo Standard Overflow Tank Is A Functional Treat For The Eyes! This reservoir is for your 1921 1925 Yellow Cab Model O 5 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