It’s recommended that you replace your rollers when you fix a broken garage door spring. For all but the bottom roller, you can simply remove the brackets, slide the old roller out, and slip the new one in before replacing the brackets.
For the bottom rollers, raise the door up, bend a small section of the vertical track with vise grips, and pull the door down until the roller pops out. Replace the roller and straighten out the track. Once the new rollers are installed they should easily glide in their tracks.
This concludes your garage door repair project. Job well done!