As far as I'm aware only the A1533 (16GB) is available, the others having been retired.
It would help the confusion @figment_uk because there's at least 10 help questions a day asking the exact memory size of the iPhone 5s because of the specifications description and there only being the 16gb version available.
These are just today alone and it's been the same everyday since they stopped selling the other versions, just a simple change to save confusion.
@endorphin you'd think so, wouldn't ya? Buuuut let's consider how long other simple edits take, and also throw in the fact that those help questions most definitely help optimise SEO where iPhones on gg are concerned.
I doubt it'll ever be corrected tbh!