It's actually a 4mm sheet metal screw that goes into a "U" clip. A good substitute is a #8 x 3/8". That would actually be 4.2mm x 9mm.
Originally Posted by bluebee
Note: Googling, I find there is M4x10x0.7 (which is a course thread) and M4x10x0.5 (which is a fine thread) so I 'assume' it's an M4x10x0.5.
I just realized I can remove the bolt on the passenger seat and just match 'that' at Home Depot...
2001 530i/5 S+P CDV delete/Akebono ceramic pads
M5 SSK/RedLine MTL/M5 rear sway bar/Bilstein HD
BMWCCA Member #337964