95 Caravan front door hinge

On the front door you have the (2) rollers that hold the door when you open it. My problem is that the second roller(the one when the door is completly open) is sticking? or worn or something as when I try to close the door it has to be pushed hard to actually 'pop' it to close. I have sprayed this roller several times with WD 40 and worked the door. It seemed to help but still it sticks. Is there a type of grease to use on these rollers or can they be replaced easily $$$ as I think maybe the roller pin may be worn and causing it to not roll correctly when trying to close the door? Weird too, it is the passenger door, normally for me any older vehicle I have had, its the driver door that has problems.

Thanks....Larry