Replacement studs are designed to pull in your original will have been screwed in then peened over at the rear.
You have to take the hub off to fit new ones , it has been known for people to screw old on in and put a spot weld on rear to stop it coming out , stud will not be dangerous as long as threads in hole are still sound.
The pull in version require hub drilling may also be the later larger size depending what year your current hubs are.