The RocketBox # Y07192 does not have vehicle specific fits, but it should work for your Lexus RX400. You can confirm this by taking a few simple measurements.
First, I would compare the dimensions of your vehicle roof to the dimensions of the box. It measures 74 inches long by 33 inches wide and 16 inches tall.
The # Y07192 roof top cargo box will fit on square and round Thule or Yakima style bars, and fits most factory roof bars, but I would recommend making sure the distance between... view full answer...