In my house I have two external outlets like this:
Both of them cracked and need replacement. Though I found a straight replacement (Leviton 4986-GY 1-Gang Duplex Device Wallplate Cover, Oversize, Weather-Resistant, Thermoplastic, Device Mount, Horizontal, Gray) based on reviews they will crack soon again.
I tried to find alternatives but there are no clear candidates. Ideally I'd like to install something like weatherproof deep in-use cover one but they don't cover underlying round box. What are my options?
Update. Followed the answer, worked like a charm! Need to paint around outlet.