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52 17... Replacing Padding For Front Seat Thigh Support

WARNING: This page is about a different car, the 2010 BMW M5, 2009 BMW M5, 2008 BMW M5, 2007 BMW M5, and 2006 BMW M5. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Removing Plug Connections And Feed Out Through Trim
G04742852Courtesy of BMW OF NORTH AMERICA, INC.

The work operations here are shown on the version with air conditioning and seat heating. Feed out seat cover (1) in area (2).

Installation: 

Seat cover (1) is fastened by hooks in trim (3).

Remove plug connections (4) and feed out through trim (3).

Remove trim (3); if necessary, remove padding or cover.

Version with seat heating or air conditioning: 

Feed out cable (1) and remove padding (2).

Installation: 

Ensure correct cable routing (1).

Fig 2: Identifying Correct Cable Routing And Padding
G04742853Courtesy of BMW OF NORTH AMERICA, INC.

Version with air conditioning: 

Fig 3: Identifying Net And Fan
G04742854Courtesy of BMW OF NORTH AMERICA, INC.