Yes the pins are treathed with a very corse thread. As i don't own the cars any more i can not help you with pictures and such. But there must be holes in the floor if the studs have been in there. So look for a screw in the floor being there without any reason than just to close the hole. Or look for a weld. They are right in front of the seat and you can see where they should be about as you lay your mat on the floor where it should be about.