Unfortunately, you are in the minority as far as LW users go (using a Mac). Most plugin authors just don't find it economically viable to develop Mac plugins (costs of Hardware, Compilers, exta lightwave seats, etc).
Much of the plugin development community are either Lightwave users who write plugins to overcome their own problems, or in-house studio developers writing for their own animators.
The simple fact of the matter is there are many, many more LW users out there on PCs, and until that situation changes, most plugins will only be available for PC.
That said, the best place for you to go search for available plugins is
www.flay.com - they have possibly the most comprehensive database on the net - if it's not there, its probably not worth bothering with.
You could try checking for the C4 set of plugins - these facilitated the destruction of objects within LW - not sure if these were PC only or not - again, flay.com is your friend.