Check ebay. Google, etc. My 83 w126 300SD has alot in common with the w123 models so I can use a haynes manual for most of what I need. I'm not sure of the newer year models like yours.

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If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon