If you mail in your boat registration payment this year you will have to pay for the $16 mussel stickers online as a different transaction. You won't be able to mail in $36 and pay for both the CF stickers and mussel stickers as in the past. You can get both the CF and mussel stickers if you renew online or go in to DMV in person. You can also get both stickers at a AAA office if you're a member. I was told to wait for 60 days or less before 12/31/2021 if done at the AAA office. Included with lakes, you need a mussel sticker if you fish in the San Joaquin and Sacramento River Delta system.