Mich. Comp. Laws § 445.1455

Sec. 5. (1) The provisions of this act are supplemental to any agreement between the dealer and the supplier governing the return of inventory and the dealer may elect to pursue either a contract remedy or the remedy provided in this act. With respect to a dealer located in this state, a remedy provided for in this act shall not be limited by any agreement or contract between a supplier and a dealer. (2) An election by the dealer to pursue a contract remedy does not bar the right of the dealer to the remedy provided in this act as to that inventory not affected by pursuit of the contract remedy. (3) Notwithstanding anything contained in this act, the rights of a supplier to charge back to the dealer's account amounts previously paid or credited as a discount incident to the dealer's purchase of the inventory repurchased shall not be affected.