Preparing the special tool

NOTE: TECHNICAL INFORMATION
In a profile rail pair, two profile rails are connected to one another by gearing.

Fit the special tool completely on to special tool 0 490 133 (00 2 030) with the help of an auxiliary person.
Insert special tools 0 495 821 (31 5 255) in telescopic supports of a profile rail pair.
Insert special tools 0 495 819 (31 5 253) in telescopic supports of other profile rail pair.

Courtesy of BMW OF NORTH AMERICA, INC.