Ok, mine came with 4 bolts and I don't see any gaskets here. Do I simply replace these with what the kit came with, just plug and play? Thanks

 

Also, in this photo I only see one place for the floor jack, but this is where I want to put the jack stand. So the floor jack is in the way of where I want to put the jack stand so I can then jack up the other side...any suggestions?
Im still amped to do this myself but

 

Use the factory gaskets the supplied nuts and bolts

 

This!
Edit: For catback, however, there's a set of donut gaskets come with the kit, since you said axleback, then yup, reuse the cone shaped gasket and supplied nuts and bolts.

 

Jack it up from the center of the differential. Then place your jack stands on each side.

 

Yup yup for the donuts you reuse the OEM one. They are a crush type application so they are really great quality from the factory, the other gaskets you are referring to are for the 2 bolt and 3 bolt flange types and those are not necessary in Donut Gasket Applications. Everything looks on point, and like 39RN said center of the differential is a great place to jack it up keeping the jack points on the side from being bent in. hope that helps!

Lou @ Modinjapan.com

 

I installed my joez catback by backing up on to some ramps to lift the back end. Much easier than jacks, imo.

Since they are crush gaskets, shouldn't you replace them with new ones instead of reusing?