The first benches went to a place by the Museum entrance, but that area is pretty much full now...
It seems current benches end up around the outside...
Bricks by the entrance, a fair number of which are memorial bricks...
But those are spreading around the outside too...
In my opinion, a brick would fit in better. They're already running out of space for benches, and the number of those they have now looks cluttered already. Bricks look better the way they have them now (although they are running out of prime spaces, there's lots of new sidewalk and new brick spaces resulting from the recent expansion).
I think the big brick would be fine.