Anodes- What do i need.

This is my first boat that stays in the water and i know i need to grab some anodes, hoping someone can tell me what though! 2003 342 with Bravo 3's. I know the p.o told me as does the maintenance excel sheet i received with the boat that when he replaced the lower legs of the B3's he got the newer version with extra anodes. So since i don't yet have access to the boat but i am attempting to show up with all items needed can someone tell me what i need.
2003 Rinker 342 Fiesta Vee, 350 Mag MPI, Bravo 3 2.20:1 w/ 22p 4 x4 props
Comments
First, I assume your boating will be fresh water boating - that would be Magnesium anodes. If you boat in brackish water (salt/fresh mix) you would want Aluminum anodes and ocean salt water would ne Zinc anodes. I have the kit # for Mercruiser parts somewhere. I'll look it up if someone doesn't post it first. You can also but the kits at West Marine, Defender Marine and a lot of marine supply stores.
2002 FV 342 on Lake St. Clair - Past Commodore SHC - Vessel Examiner USCGAUX
http://www.boatzincs.com/bravo3-mag-kit.html
Go Steelers!!!
Mercruiser Anode Kit for 2014 and newer Blll drives with prop anode: 888760Q04MM I paid about $111 for each kit *****MM stands for magnesium
From West Marine:
Bravo lll 2004 to present: Magnesium Anode Kit - 11426764 $119 each
It says this kit contains the extra pieces required for newer B llls