This is correct. However - whenever purchasing authentic plates (the term for this type of plate) you should always buy them in pairs. This will ensure that someone in Michigan is not already using the plate before you waste money on it. Of course, you can always write down the plate ID and go to the Secretary of Hate to ask if it is in use, but depending on where you live that can be a long ordeal.
Print out this PDF, fill it out, send in your check and you should have your registration in about 6 weeks:
http://www.michigan.gov/documents/hplate_16252_7.pdf
Mad Max's is a great place to purchase authentic plates from. I've been dealing with them for years.
And now for my public service announcement: NEVER EVER EVER use Darryl's License Plate Restoration Services in Pennsylvania.