I believe the simpler one superseded the more complex one. I replaced all 4 on mine when I got it, confirming your part number, soon after I got my 2001.

I can only guess that the complex, springy ones would eventually fail - due to moving parts. And if a simpler one can get the job done well enough, it's also less likely to fail, so it's a winner.

__________________
2001 X5 3.0i, 203k miles, AT, owned since 2014