I have a 2005 Mercury Grand Marquis GS 45k on it.
I have steel wheels on it, but I want another set of steel rims to mount 4 studded snow tires on it.

I was wondering if the 7 hole rim that is on it can be interchanged with the 12 hole steel rim?

And the big question: What type of center cap will fit on these rims? I wanted the center cap that was on P71 vehicles.

If anyone can help me out I would appreciate it

 

I just thought that someone would want to know what engine and color the car was.