1.1 rooster is living in a pen close to the house the other one is in a cage with 1 hen and the other one is free ranging with hens
2.They are fighting with each other and hurting each other
So they fight even if you let them all free range?
Many times, roosters that fight in a small pen are fine when they have lots of space. But if yours fight when free ranging, then "more space" obviously is not the answer. I see why you are asking about blinders!
I didn't know for sure whether blinders would help or not, so I did a search for similar threads from the past.
I found one where the blinders did not work:
https://www.backyardchickens.com/threads/fighting-roosters-pinless-peepers.1380931/
(The first post is relevant to your question, but the rest of the thread is discussing other details. If you're short on time, just skip the rest of it.)
I found one where someone asked about blinders, someone else said they would not help, and no-one actually tried it:
https://www.backyardchickens.com/threads/pinless-peepers-for-multiplw-roosters.1483315/
I would have expected more threads on the topic, but I mostly find ones about stopping feather picking or about stopping hens that are acting like bullies (results are mixed on that: sometimes the bullying stops, sometimes not.)
At this point, you probably don't have much to lose by trying the blinders. I'm not sure whether they will work or not, so please share the results if you do try them.
You've obviously found that separate pens do work, but I agree it's nicer to have them all content as one big group if possible.
