Clips for sure…amd maybe some glue that let loose long ago on my old seats. But I definitely found clips when i disassembled the seats I had re-covered. Check out https://www.realoem.com/bmw/enUS/sho...diagId=52_2624

The problem is that they are glued to the back of the panels.

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Current
Original owner 2002 E53 X5 4.4i to 4.6i swap
2026 G80 M3 6 spd
2025 G06 X5 50e
Former
1972 Audi Fox
1986 Saab 900S
1996 BMW Z3
1998 BMW E36 M3 Sedan
2004 BMW E46 M3
2006 Audi A3 Quatro
1993 Mopar 318 Jeep Grand Cherokee
2015 V6 Jeep Grand Cherokee