An intact male will almost definitely fight with your current intact male. They just don't get along.
You may be able to bond him with a spayed female. Spayed females can be found at rabbit rescues. But it would be best to first have your boy neutered. Once he's neutered and has had 8 weeks for his hormones to dissipate, then he can meet some potential fixed females at a rabbit rescue. Otherwise, I'm not sure that a rescue will allow you to introduce an intact rabbit to one of theirs.
The advantage of going through a rescue is that you will save lots in costs. Spaying rabbits is expensive, but the adoption fee for an already fixed female is usually significantly less than the cost of a spay. Plus you get the added advantage of pre-screening for potential compatibility. And the rescue will work with you to ensure you wind up with a compatible match. (Rabbits can be most choosey about what other rabbit they may accept.)
