Has anyone replaced the internal zinc anodes on the engine block?

I have a 2015 DF140A and I'm not sure where the internal anodes are. I know there are 4 of them. Having been able to find any pics or diagrams yet. Thanks

buy them, you'll see where they go. There's 4 on the port side of the block if I remember correctly. Easy to change, write in magic marker on the block when you changed them so you remember.
http://www.brownspoint.com/store/pc/...brphoCACrw_wcB

Thanks