This is the original plastic part which had the following problems:
At point A, the edge of the bezel was pitted which caused leakage at the gasket.
At point B, just below the letter B at the left corner, the fine edge was broken off.
At point C, the screw boss was broken off.
There were also lots of pinholes everywhere.
The plastic bezel was prone to cracking at the corners after being delivered to the customer.
This is the aluminum replacement part.