There were 4 of 5 variations on the fuel pump "coffee can" cover.
Yes exactly, four.
Two box-like covers for the 230ies with spare wheel well, one closed (coffee) can-like for the other 230ies (see pic of Bob's (cascadiaclassics) phantastic metallic-red 230 he sold a while ago) and the late style open-can for the 250/280ies with 82 liter tank, which is still available.
Some individual in Germany made reproductions of the box-like cover for the 230 SL (VIN 000203-007204) with spare wheel well. I could find out whom, if someone here is interested.
Achim