My mat tabs are fixed through the actual carpet. They are plastic and the mats have a recess to allow them to fit over/on and then turn the tab 90 degrees to lock the mat down.
Cass
ok, forget about the mat part, say you lost the whole mat,and all your left with is the lug in the carpet on the floor of the car, you buy new mats but they dont fit yout old lugs, so you want to remove the old lugs, how do they come out !!