The MB original fuel pump would be A 001 091 52 01, still available as it seems.
It replaces: A 001 091 34 01 and A 001 091 46 01.
According to XENTRY (EPC) it needs to be supplemented with mounting details:
+1 A 108 470 02 81 fitting
+3 A 126 988 00 11 rubber buffer
+3 N 000127 005203 washer
+3 N 000127 006203 washer
+3 N 000933 006016 bolt
+3 N 000934 005004 nut
And the car was running on LPG ?? Interesting, I hope it did no harm to the engine.
Regards from Ingvar in Sweden
109.018.12 1968 Bronze Braun (M100 in good shape)
126.039.1A 1988 Dunkelblau (M117 so a bit slower)
+ A few other MBs used for daily transport