What zincs do I need?

[lord1234]

I just bought my first boat. It's a 1997 Hampton Larson 250, it's powered by a 1997 Rindell Volvo Penta, inboard with a Cobra SX outboard. I'm trying to find out what zincs I need to buy for saltwater use. I found one of them on the boat, it's U shaped, and I am pretty sure it's part number is CM983494Z

Are there any other zincs I should be aware of?

Also, is there a serial number somewhere on the outdrive? I can't find one anywhere on it.

 

[Horigan]

There are two anodes on the drive. The other is on the bottom of the transom mount. Google Volvo Penta SX anode kit. For pure salt water use zinc anodes. If you do both salt and fresh water use aluminum anodes.