Try searching ebay. They pop up once in a while, but keep in mind they will cost you around 200 bucks or more.
The system is just an original floyd rose, but the sustain block is removed and the tremolo is attached to a groundplate which you can attach to your exsisting les paul with 2 studs going into your tailpiece bushings. You will have to remove the ABR studs or unscrew your nashville studs. The groundplate will cover the remaining holes. You could use your exsisting tailpiece studs like I did, but there should be special studs included with this system.
I have used this system on my lp classic, but my neck angle wasn't big enough, so I couldn't get the bridge far down enough.
The two studs for the floyd rose are screwed into a square hardened piece of steel that are pushed into the cast groundplate. Because of the spring tension of the 10 springs at the back, the tremolo applies foreward pressure to these studs. The hard steel inserts will disform the soft groundplate, so the studs will tilt a bit foreward. I have experienced this on 3 units so far. This will make it hard to keep your guitar in tune.
You'd also need a kahler locking nut behind the nut or you can use locking tuners and a graphite nut. IMO it's not worth installing a locking nut, as you will have to drill two holes in the headstock (I did it... I regret it).
Oh by the way, you can only use the tremolo as dive only. You cannot pull up notes. The upside is that you can tune your guitar in drop D or other lower tunings.
Here's a pic of the system fitted to my LP classic:
