Depending on the model number of the HSU 10, I believe there was a Dayton clone at one time. I suggest you find out what a replacement driver would cost from HSU and take it from there.
Yes, I was thinking P.E. would have a replacement driver for it if it's a clone of the HSU. As for the link to the Dayton sub to see if it works, what is the internal volume and tuning of the HSU sub?thanks for the link but that is a fully assembled unit