It is to be mounted under a kitchen counter, i.e. built-in. The manufacturer and specifications aren't that important, it's just supposed to fit. The width of the table top is only 50 cm. There is something with such a dimension?
If you have a 50 cm countertop, you should look for a 2 cm shallower dishwasher in order not to look stupid. Honestly, I don't think you will find it. Some companies (I think Siemens and AEG) make shallower but then their depth is 55cm. Below that I have not heard anyone do ....
Built-in dishwashers are just 55cm deep and fit under a 60cm table top. there are no exceptions to this. dot. Compact dishwashers - i.e. small freestanding dishwashers - are 50 cm deep, so they have exactly the dimensions you are looking for, but that's a completely different story.