Freud doesn't sell power tools anymore according to what we hear. They weren't made by Freud anyway, they were made by Felisati in Italy and Freud was probably trying to take advantage of the reputation they earned with their blades and bits. People have come here looking for collets and speed controls and we know of no sources for them. With that in mind I don't know what the chances are of you finding other inserts. Your best bet may be to drill the one you have out. You didn't fill out your profile so I have no idea of your skills or what tools you have to work with but you could use a Forstner bit in a drill press the same size as the existing hole to center it on your drill press table and then clamp it down and change bits to a larger size.