HP ProLiant ML150 G6 Drive tray 3.5" to 2.5" adapter

Adapter to fit 2.5" drives in the HP ProLiant ML150 G6 3.5" drive tray.
Should also work for ML330, ML350, ML370.

Confirmed by users:
ML110 G7

Updates:
26 May 2019 - Added v3 of the adapter, just optimized it to use less plastic.