I have a vacuum tank converted to a recovery tank. Its a 4" wide tank and about 8" tall, covered in a black wrinkle finish. I modified the feed (from radiator) by inserting a copper pipe swirling "S" into the tank and having it thread into nipple at the top. The bottom nipple has a copper pipe that points 6" up from the bottom so when the tank starts filling up the excess can start dripping out through a rubber hose on the outside of the bottom nipple which is sticking out of my valance.

It sits right in front of the battery area between the rad support and the grille