Question about Holmberg Parcel letterbox 50x38x112cm anthracite

We also wanted to use the old lock from the letterbox but it was too big...🫣 for the rather small hole.
What's more, the letterbox and the parcel compartment have 2 different locks and therefore 2 different keys. It was tedious at first but we got used to it.
After a quick measurement, the hole in the letterbox lock is approx. 1.5 cm and the parcel compartment lock seems to be slightly larger.