Need plastic wheel for 4011/4012?

Hi Swisco! Attached are pictures of my mirror door rollers. The outer piece is stamped 4012 and the inner piece is stamped 4011. Do I have to buy the whole roller or can I just buy the plastic wheel which is the only piece that broke - the ridge/lip that hugs the pin that it's attached to broke off. The rest of the roller is fine. If I need to buy the whole roller, is the 23-041 roller the correct one? Thanks!