Tanks: take a walk through your local salvage yard (if they will let you) look under as many hoods as you can to get an idea whats out there. The oldest vehicles have some of the better shaped tanks. Look for one that may fit the void you want to stuff it in. Having a measuring tape with you mat be helpful. When you find one, inspect it for crazing (fine cracks but not broken through) If there is excessive crazing don't get it it will break easily. Look for signs of UV degradation as this type of plastic doesn't like sunlight. Milk white, barely translucent, with a semi gloss skin is good but grayish white with a matt finish is bad, don't use the later. Any tank that may have sloshing fluids should have as much support as possible. My tank is a two gallon and came out from under the hood of a late eighties chevy pickup. It now resides in the left well under the hatch deck floor, The battery is on the right. the pump is next to the tank. Hose routes to the right then forward. Good Luck!