Seat mounting rails bent out of shape
(Saddle) rails is the correct term. They are part of the saddle/seat. I’m not aware of any saddle where they are replaceable.
You might be able to bend the rails back but it could compromise stability. Considering a new saddle only costs a couple of euros I’d just replace it.
For a crash to bend the rails like that it takes quite some force. I recommend a very careful inspection of the frame, seat post and all other parts of the bicycle.