Your search for "Sway Bar System" revealed the following:
F8X/F2X/F3X WEIGHT JACK HEIGHT ADJUSTER
$549.00
Ground Control Suspension Systems is now offering the first articulating weight jack height adjuster for the F8x BMW chassis. These rear spring mounts and adjusters allow articulation of the rear spring throughout its compression and extension allowing for a very consistent linear travel and rate; just how your springs are...