Revo,
Brownells has an oversized bushing kit tap and bushing set available. Get it. Get the bushing driver too, as it applies to your needs . .
Can't recall if they offer it in a slim bushing kit though . . . Don't forget the proper sized bushing grip screws... . .
Something is bound to happen again in the future with a bushing, so the kit is a good investment anyway, and extra bushings are good to have.
Don't forget to protect the frame around the bushing with tape of some kind before the bushing removal action . . .
Soak the bushings with Kroil for a while.
Use a vise grip and to turn them out- they will be ruined. Use the Brownells kit that you should have on hand, if needed,to install new oversized bushings if the threads into the frame are damaged.
After you get the original ones out, the threads may very well be stripped or damaged. The Brownells bushing driver is very good, but the one I have won't remove a thin grip bushing- but it is great for installing or removing a regular one as it supports the bushing structure and prevents unwanted slippage.
Clean, degrease as applicable and blue locktite the new bushings in . .
hope this helps