Mont. Code § 33-26-102
In all cases where an undertaking or bond or undertaking with sureties is authorized or required by any law of this state, the officer taking the same must, except in the case of corporations as mentioned in 33-26-101, require the sureties to accompany it with an affidavit that they are each responsible and are residents and householders or freeholders within the state and are each worth the sum specified in the undertaking or bond, over and above all their just debts and liabilities, exclusive of property exempt from execution. When the amount specified in the undertaking or bond exceeds $3,000 and there are more than two sureties thereon, they may state in their affidavits that they are severally worth amounts less than the amount specified in the undertaking or bond if the whole amount be equivalent to that of two sufficient sureties.
§ 33-26-102, MCA