If you take the cover off the breaker panel you will see the mfg of the breakers. For the most part they are a standard mfg. If you can not tell then remove a breaker, take it to a big box store or good hardware store and find a match.
Side note, each to there own, but to carry extra breakers. How often have your house breakers gone bad.
2007 Itasca Meridian 36SE
Great Wife & Max the boarder collie
Branson MO the best place to live