Shootozen, I realized I didn't answer your question.
No, pickup covers wont fit over the 500 series pickups.
The coils are set into a sort of "upside down" cover. If you look at the picture, you can see a rim around both coils. The pickup is set down into this grounded cover with the tops of the coils exposed for sensitivity or cosmetic reasons, I don't know.
Personally, I like the black coils with chrome trim look. If you have black or gold hardware, get the all black version. They also do the one black/one creme coil look which looks cool on a guitar with creme colored binding or plastic parts, like a Les Paul Standard.
Whatever look you go for, I do recommend trying Lawrence pickups in your search for "that sound".