Where can I buy new dials for my diverters? What are the sizes I need to get to replace them? My spa looks just like this, just not sure if it is a 7.1 or a 7.2….thank you for any help you can provide! Just replaced a pump that malfunctioned and want to fix up the rest of the tub since we have had it a while….got new pump, new pillows, now the diverter dial covers are next as they are sticking and not twisting easily….