Among the last components to arrive at the shop were the King prototype struts. Skilton demonstrates the size difference between the stock MacPherson strut and the King strut on the right. Why does the King need two reservoirs? The tank on the left holds nitrogen to pressurize the strut; the tank on the right is for oil. The piston in the can is so big and displaces so much oil, it had to have a place to flow to outside of the strut body.