They had knurls where my existing studs were smooth. Bryan Zana mentioned on facebook that he warped his flange putting in knurled ones, so abundance of caution I trimmed the knurls a bit and put some loctite. It was still a very firm pull with my electric impact so I feel confident they're in there pretty good and also happy with the choice to trim them down slightly.
Pushed old ones out with a ball joint separator, pulled new ones in with a stack of greased washers and a reversed lug nut. The new ones did go in with the axle in place but I am sure any longer and you would need to pull it out or drill a backing plate hole.
gave me plenty of turns.
