Here’s the OEM lock.
https://southco.com/en_us_int/mg-01-110-50
The original is plastic which has pros and cons. I would call it an indicator rather than protection. They break apart easily so it won’t stop anyone determined (my wife broke ours with a sharp tug not realizing the door was locked)
Pro … you won’t have a safety concern with a kid or someone locked inside.
Con … it does nothing to prevent someone from coming into your boat … but it will tell you someone was there when you find it in pieces haha.
They also have a metal one that’s a slightly different dimension and is worth considering if you are installing from scratch.
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