bonding plates

[my other east]

getting ready to start the wiring on the refit, and was wondering what you guys were using for a bonding plate on the stern. I was looking at a 4" by 8" zinc, but is that too small? I have other questions too, may have to stop by and see Bruce at the shop, wink, wink, nudge, nudge... :) I love this site!!!!

[Tooeez]

I used a 4 x 9 oval anode ( a Sea Ray part, of all things!) on the transom, and it lasts about a year.