Lemforder is THE primary suspension part supplier to BMW. With respect to an E53, they were the supplier for the front control arms (forged steel one and aluminum one), the tension strut bearing, ball joint and the sway bar links.

For the rear, they supplied both control arms (stamped metal one with the ball joint that wears out AND aluminum one), the replaceable ball joint (the one you need cupped tools to pull out), the link and the sway bar links.

Lemforder supplied other parts as well - but I only can type so much.

Shocks were supplied by Bilstein, they are the low pressure version (black tube).