ISO 496ho raw water pump, mine is leaking from the seal behind pulley, thought I would look here before I go new

Don't know your serial number.
Even if you can find a used one, just rebuild the one you have. The seals and bearings should be easy enough to find

https://www.mercruiserparts.com/bam/...31815/6708/210

Yeah that's a good idea. And that way I could have a spare as well if I do find another

Get the stainless Hardin pump and don't look back. It is pricey but well worth it.

Yeah I have read that's the best option. My pump has scoring in the brass so I already have the ss washers on either side of the impeller