What coolers are compatible with Soctet FM1

Does it use a new mounting mechanism or will AM2/3 coolers work with a FM1 mobo?

I can't seem to find confirmed information, but it is the same size socket and states it is reverse compatible with AM3. I'm guessing they will use the same mounting points unless they have a very good reason to change it.

That's what I've seen too thid.
Everything from (most) 939 forward ought to fit.
There are a few 939s that are a bit different, but not much.
AM2, AM2+, and AM3 are all identical.
I think FM1 is the same piece as well, just without the sides on it to allow for smaller boards.