This is the hardware kit included with our 3.50 axle housing for the 3rd member. These thread in from the backside then the nut tightens down on the case. We don't use gaskets between the housing and the 3rd member, we use and recommend using a hi-temp silicon gasket maker like "the Right Stuff". If you're looking for something stronger, you can upgrade to the ARP studs we use in our 4.00 housings.