Hello,
I beleive it won't fit as the two sets of speakers have different binding points for speaker wire, the 2000 range have it on the bottom of the speaker for easier/neater bindings and i think the holes on my 1000i centre bracket wouldn't accomodate those binding positions. I know the two sets of speakers can be used with each other with no probs (say a 1000i centre with 2000 surrounds) but i'm pretty sure the brackets are specific to each range.
To be totally sure i would give Q Acoustics a ring, they are really helpful (for a change lol) and will be able to give you the definative answer.
Nick.