Seat belt connector bushing (shoulder-to-lap belt connector)

Does anyone know if it's possible to replace the rubber/holder bushing that goes on the lap belt shaft that the shoulder belt slot connector goes onto that keeps it tight? My driver's side one is missing so if I hook the shoulder into the lap it'll just fall out. The passenger side is fine though. Maybe it's possible to switch the passenger side to the driver side?

Jim
'72 Dart Custom

If no one knows, how about a source just to buy the entire driver belt lap and shoulder composite system?