Good used working sunroof motor removed from W126 300SD with good red clutch adjustment lock nut. Will also work on 1981 to 1985 W123 but the mounting bracking may be different. You can use your exisiting bracket - easy to change.
Fits 126 380SE 380SEL 500SEL 300SD 1981 to 1985 with non-tilting sunroof and 123 see below
Early W126 Sedan Late W123 Sunroof Motor and Drive Assembly - USED