The size of the hole in the pickup base plate that is used for the height adjustment screws may be an issue.
Many times the hole in the pickup has been enlarged and the threads have been drilled out for the wood screw that is used to secure the PU to the body. So now the standard pickup ring height screw can't be used.
I've seen guys solder a small nut to the underside of the base plate, or you can re-tap the holes and use a larger machine screw.
If a small enough wood screw was used and the original threads are still in the hole in the base plate, then you are good to go.
Worth checking BEFORE you decide to drill the holes to mount the ring.
edit: should also mention that for floyd style guitars, you probably need short FLAT pu rings. Don't buy a set designed for a Les Paul. They will be too tall, and the tops are angled.