Mich. Comp. Laws § 168.692
Any person nominated at a primary election by more than 1 political party, or certified as a nominee by more than 1 political party, or nominated by 1 political party and thereafter certified as a nominee by another political party, shall be notified of such dual nominations by registered or certified mail with a return receipt demanded, by the county clerk, or clerks of the several counties affected if for a state or district office, immediately upon certification to him of such nominations by the board of canvassers or by the party committees, as the case may be. Such person shall, within 3 days after the receipt of said notification, advise the county clerk or clerks in writing in which political party column it is desired that his or her name be printed or placed on the ballots or voting machines for the ensuing election. Any person who has been certified for more than 1 office, except where 2 or more offices may be legally combined, shall be notified in a like manner and shall, within 3 days of receipt thereof, advise the county clerk or clerks of the particular office for which he desires to be a candidate.
MCL 168.692