I can remember them. The rivet heads are recessed in the pads, but their installed height still limits the amount of overall wear the pads can tolerate before replacement becomes necessary. Once the pads are worn down to the rivet heads, the rivets can score the rotors. And if the rivet heads are worn completely off, there's not much left to hold the pads in place. Maybe the vans did not have rivetted pads, I dunno. The outfit I worked for would wait until something bad happened before they would do anything about it.