Necessary preliminary tasks:

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Remove bumper. See 51 11 000 Removing and installing complete front bumper (from 10/01)

Loosen screws (1).

Pull bracket forwards out of T-guide (2).

Fig 1: Loosening Screws

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Installation:

Feed inner bracket (1) into T-guide (2).

Fig 2: Installing Feed Inner Bracket Into T-Guide

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Loosen screws (1).

Detach bracket to middle from metal fold (gently pull downwards if necessary).

Fig 3: Loosening Screws

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Installation:

Level for placing on metal fold
Level for subsequent clipping in of bumper

Fig 4: Installing Level For Placing On Metal Fold
Courtesy of BMW OF NORTH AMERICA, INC.