Eaton Posi Install Kit

[hawkfan]

I purchased a slightly used Eaton Posi unit from a member here a while ago. I'm ready to get it installed, but want to make sure I have everything before I take it to the shop. It already has bearings/races with it:



I'm a novice, so I'm not sure what all needs to be replaced in the diff to make this work. I saw that eastcoastgearsupply.com was recommended on here and wanted suggestions on which install kit to buy from them:

http://eastcoastgearsupply.com/c-28...5-inch-install-kits-bearings-seals-shims.html