Quoting Boostx:
They are just the bushing. you will need a big G clamp to press them in. When the subframe is bolted up it will be secured in place..
Without a sleeve, will that keep them in the subframe?
I'm only asking this because of the fitment issues with the Noltec pieces. Depending on the car, you could wack them in with a rubber mallet. That wasn't tight enough though, they needed to be shimmed and pressed in with a press.
If they aren't in there really tight, they will move up and down. Without a sleeve, I'd bet the urethane wouldn't last that long.