By saying the door "bumps" I'm assuming you mean it hits the striker hard. To find out if hinge pins are worn or if it's another issue grab the door by the handle while it's open and lift it up or down if it moves excessively the pins and or bushings are worn. You might find good used hinges in the junkyard.As far as the rollers go they are refering to the roller on the hinge that rubs against the u shaped spring that can be the cause of your "bumping" as well.Once again find good used examples in the Junk yard and be done with it.
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