Almost all if the 14" hubcaps from at least 1972-1985 are identical I believe. This makes them available quite regularly. Of coarse the diameter of the hubcap is more like 15.5" which results in some people listing them as 15" hubcaps, but almost all of them are for 14" wheels and made of stainless steel.
There are similar and different hubcaps. For example, one of the hubcaps that came with my 1972 250c is rusting pretty badly. I believe it was told that some early hubcaps were chrome over ferrous metal. I guess that must be true.
Also, earlier models, like the early 60's had rings and dog dish caps and mounted on special wheels with prongs for the dog dish caps.
In any if these cases, the MB star and circle were left unpainted and the hubcap was painted body color, or the color of the hardtop. Some cars got a different color on the data sheet / data card for OT and UT. For example, I owned a 1973 450sl that had a white body and black hardtop originally. My assumption is that the wheels matched the hardtop. The
Car came with unpainted caps though as the previous owner stripped them to bare metal, which IMO is also a good look. Then, with my two tone 1972 250c, the lower body is black and the upper body is white. The hubcaps are black. So maybe I am simply wrong about what color the hubcaps are supposed to be, or what they should match
In any case, painting the hubcaps is a little tedious. I painted one, and masking it off took what I considered to be a ridiculous. I have seen a tool on ebay that covers the star and circle and wished I had bought it.