My friend put 1994 E420 brakes on his 1990 300D 3.5 Turbo, but he took the front brakes, and the hub that has the bearings, and then where the hub bolts onto, the spindle, which is pressed (attached) into the (I dont know).

The (I dont know) is bolted to the ball joint, the steering linkages, and the strut, and the two calipers bolts bolt to this piece.

What is the (I dont know) called?

I measured from the hub face where the rotor sits to the closest part where the caliper bolts to, on the measurements above.

Thanks,

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Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.