So I had new tires put on the S4 a few weeks ago but my plastic center caps were shot...mostly broken and siliconed in place. I just got new ones shipped out and go to have Discount Tire put them on and the fronts are no problem as the center hub holds them from going anywhere. The rears are a different story. There is nothing to lock them in place from falling back into the wheel. Am I just missing some sort of locking plate to hold them in place or is this just the oddest design for a center cap around? I can't imagine I have to glue these in from behind the wheel??! Anyone else dealt with this? Thanks.