不太清楚。下面抄自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里面在介绍第一代（05-10年）的车时，提到一些Independent Car Mechanics发现许多部件可以和奔驰车互换（就是尺寸都是一样的）。