I have a question. I keep seeing these slotted hubcaps for sale for '68 Cadillacs. At first I thought that the few that I saw may have been altered by someone for whatever purpose, but now I see many more of them. My question is: were these correct for on the front of cars with the disc brake option, to help dissipate heat? That was my only idea. Anyone else know? Here is a pic I took from Ebay: