27-2-503. Conflict of laws -- limitation periods. (1) Except as provided by 27-2-505, if a claim is substantively based:
(a) upon the law of one other state, the limitation period of that state applies; or
(b) upon the law of more than one state, the limitation period of one of those states chosen by this part applies.
(2) The limitation period of Montana applies to all other claims.