All this talk about front ends and PM here is my list on the W126, let me know if I missed anything.
Actually what I have found on W126 bodies is that when you purchase them you need the W126 repair kit which includes: Both guide rod bushings/bearings New lower ball joints (special press required) New idler arm New center drag link New left and right outer tie rod assemblies New shocks New steering damper Reseal PS box if needed. Rear sway bar arms/adapters New breaks Left and right Motor mount Fuel Filter(s) Oil Filter Air Filter Plug, Cap, Rotor, Wires (Gas engines) Valve cover gasket(s) Cam oil tube plastic pieces, especially on gas models Timing chain, if car has over 150k Water pump, if car is over 150k Diesel Purge (diesels) Air cleaner mounts (diesels and gas models) Oil filter 'o' ring (diesels) Replace oil filter to block gasket (diesels OM617) Injector overflow hoses (diesels) get spares Rubber fuel lines (Front and rear diesels) Rear high pressure fuel line (gas models) *** Very important *** Door check straps Foot well lights under door Wiper blades Brushes for alternator New belts New radiator hoses Thermostat New breaks, rotors, and front wheel bearings as needed. Brake dust shields for front wheels Transmission gear selector bushing Transmission filter kit Piece of tin to bolt on transmission mount so oil leak does not hit exhaust. New set of fuses Spare Blower motor fuse Spare Bulbs (especially little odd tail light ones) If trip odometer broken then www.odometergears.com Check mono valve, replace if needed Hood pad New floor mats Repair all broken power windows and switches Exhaust hangers and spares Any buttons gone on power seat switches that are gone Replace sticker on HVAC temperature wheel Service Differential Resolder cruise control Check/replace center HVAC vacuum actuators Resolder HVAC vacuum solenoids on 1987 and newer (cut open black box to find PCB) Check replace idle speed control system (gas models) Check replace fuse in over voltage protection relay (OVP relay) Replace ignition switch (mechanical part, yes it is bad) Replace springs in driver's front seat if needed Replace horse hair in driver's front seat (it is needed) Transmission rebuild and new B2 as needed. Drive shaft flex joints Did I miss anything? Trampas