Well ....
the courtesy light /entrance light design changed several times throughout the W113's production period,
and today only the last style, the 113 825 0142 part is available; that's the one SLS and the dealers sell.
The earlier part (number) 113 825 0042 is NLA.
Nevertheless, the design of the early style (the one _with_ the chrome or silverish surround) changed slightly several times, especially there are different designs of the little light switch (knob).
If you do not like the modern replacement from MB (neither do I) there is only one way, hunt for a correct antiquarian one. :'(
However, we had a discussion about entrance lights here before a while ago. So, it's well worth to search for that on the forum. There were links to the Volkswagen courtesy light of those years which were very, very similar (but not absolutely identical). It's probably worth to go after those lights either.
Just my 2 cents ...
Achim