Oil leak from drive sprocket question

[trey]

So my warrior has had a minor oil leak and I traced it down to the drive sprocket. I see in my manual that there is an o-ring and oil seal. I plan in replacing both. Two questions. If I order a complete gasket/o ring set like the ones on eBay will it contain both of these parts? And two it's there anything I should look out for or is it really just as easy as pulling off the nut and lock washer and removing the seal and o ring and putting it back together? Anything special I need to know? Thanks. Ok so maybe three questions lol. Sorry I'm a noob.