Mont. Code Ann. § 28-11-418
28-11-418 Surety entitled to benefit of security held by creditor or cosurety
28-11-418 . Surety entitled to benefit of security held by creditor or cosurety. A surety is entitled to the benefit of every security for the performance of the principal obligation held by the creditor or by a cosurety at the time of entering into the contract of suretyship or acquired by the creditor or cosurety afterwards, whether the surety was aware of the security or not.