The latches from the 30L-series, namely 30L20-1AA and 30L20-2AA
Are no longer produced, due to the tooling that broke.
The 30L-series are special latches with a self-lifting drawhook version.
This self-lifting effect is due to a spring which is installed with the 30L series concealed under the drawhook.
You need to push this latch down in order to lock it.
The 30L1-3 and 30L1-4 latches of the 30L-series are also no longer produced.
However, these are latches without the self-lifting drawhook.
The latch can be replaced by the V934L-series latches.
More information on the V934L-series latches: