Chapter 4-14 Passenger Special Plates B. Plate Type: The plate begins with “SN” and has four numbers or combination of number and letters. C. Plate Fees: The biennial plate fee is $90 ($50 registration fee + $40 special plate fee). ALARS maintains the plate number preceded by the code “SN”. D. Expiration Date: Massachusetts Animal Coalition plates expire every two years on a staggered basis determined by the last number of the registration. Here is a link to the Special Plate online page for MAC Plates. 07/12 4:58http://www.mass.gov/rmv/express/mac.htm https://secure.rmv.state.ma.us/SpecialPlates/intro.aspx