Not sure which seal to replace

[Undecided]

I have a small oil leak on in my bottom end. I was changing out the oil and I got was a milkshake thicker than a 50s diner. So far I have replaced the impeller and water pump housing. Any suggestions would be much appreciated

 

[racerone]

So what motor is this ??

 

[Undecided]

So what motor is this ??

Sorry, forgot to note that

1999 Merc Optimax 150 SN:0T101096

 

[Docksidemarineservices]

Pressure test it.