I see this part ("PIN"), PN A1863000274, in the part list for 127.981 and 129.982, I do not see it in the part list for 130.983 engine.
Other components (dumper cage, spring, diaphragm) have the same numbers across engines, just very early number for dumper cage was very early replaced by current one.
If the diaphragm is rigid, not soft and nice, it should be replaced.