X Series X1 X3 X4 X5 X6
These are the Cross-Over and SUV BMW models.
The seats are specific to each body style and era..
BMW X1 (SUV based on 1-series platform)
BMW X3 (SUV based on 3-series platform)
BMW X4 (SUV with Coupé roofline, based on X3 platform)
BMW X5 (SUV based on 5-series platform)
BMW X6 (SUV with Coupé roofline, based on X5 platform)