不太清楚。下麵抄自WIKI

A redesigned 300 was introduced in 2011 as a four-door sedan. However, the core platform of the car, now called the 'LD' while updated, was still closely related to the original 'LX' platform. While the suspension was revised, the front suspension is still derived from the design of the Mercedes-Benz S-Class (W220) and the 5-link rear design from the Mercedes-Benz E-Class (W211).

Wiki裏麵在介紹第一代（05-10年）的車時，提到一些Independent Car Mechanics發現許多部件可以和奔馳車互換（就是尺寸都是一樣的）。