As above , the facelift to both W115 ( 4 cyl models ) and W114 ( 6 cyl models ) took place around 1973 .
Changes included improved ventilation system ( therefore front quarterlights deleted ) , lowered bonnet line and changes to front valance , introduction of exterior mirrors adjustable from inside , A pillar trim which directed rain water over the roof and away from side windows , ribbed tail lights which kept themselves clean , new padded steering wheel design and probably other changes I've forgotten .
Column change was a rarely taken up option in the manual ones ( I learned to drive in a manual , column change 220/8 ) and more so with automatics . Also automatic with diesel engine would rarely , if ever , have been specified . I can't recall ever seeing one and I drove lots of those cars regularly when they were current .
Unfortunately , rust was so prolific on Mercs of that era ( despite what owners of current models may say , they really have no idea what rust is unless they have owned a Fintail , W108 or a New Generation , /8 or whatever you want to call them ) that out of the two million or so produced there are now very few left .
Sadly , I seriously doubt that such a combination as a pre-facelift , diesel , automatic with column change will exist .
You could , of course buy a Diesel saloon , fit an autobox and adapt it to column change . A word of warning - a manual 200D was painfully s l o w , therefore I shudder to think how little performance an automatic one might have . I'd go for at the very least a 240D if you can find one . The earlier doors do fit the later bodyshell - I once saw a facelift car on which one of the doors had been replaced with one from an earlier car - it looked very odd !
I had one of the last W114 280E's with the 5 speed , close ratio Getrag gearbox , made in 1975 , that car was a flying machine and I ran it to 272,000 miles , but it too succumbed to the rust bug with most of the underneath being rotten by the time I sold it for parts in the late 1980's .
The 220
interior with column change
And the 280E