Ok just to make sure you got everything everyone was trying to say because a lot of info is going on here and its all over the place.
This is the gasket that seals the clutch cover, which is the cover on the kickstarter side. It is the only gasket needed to replace if you remove clutch cover.
The big seal is the seal that needs replaced inside the clutch cover if you are burning trans oil. The seal is located behind the clutch basket.
Your pennzoil may not be good oil to be using in a blaster. The yamalube at the dealer is not pricey and works fine. Others swear by oils but any decent oil will do for the most part. You can do a search on it if you want.
Mixing 30:1 or 32:1 is just fine either way, just keep it consistent for jetting reasons. There isn't really much of a difference between the 2 but just for reference, your 8oz oil to 2 gallons of gas is 32:1