I spoke to my contact at Roadmaster and they do not offer replacement vehicle side mounting brackets for vehicles. You will have to purchase the complete Roadmaster XL Base Plate Kit, # 1170-1, for your new vehicle.
The reason is a safety concern, and a fit issue. For safety they want to make sure no parts that were in an accident are reused, and the drawbars may not be correctly sized to fit in a new base plate receiver. view full answer...