If it already has covered then I think you will be OK. Mine is really old and has open coils.
You can take out one pickup (undo the 4 screws in the pickup ring), and measure the size of the bottom of the pickup, where the cover is over the baseplate. Take the outside measurement so that you have the maximum size. The other thing you can do is measure the size of the cavities to see. On my Hamer, the corners of the cavities had big quarter circle pieces where the surround screws in. These are what stopped the covered picups fitting. I could have changed it, but because it is a 26 year old guitar, I decided to leave it. I might fit some open h/b's later, but for now I have a couple more guitars that I am changing the pickups on anyway, so I am not in a rush.
If you let Tim know that sizes, he can tell you if they will fit.
Good luck.