Blown "S.T.A.R." tweeter on the M1

Question

I have a blown "Symmetrical Throat Apex Relief" driver on one of my Jensen M1's. Can I get another one somewhere without paying an arm and leg? I would prefer a new one rather than getting one off e-bay. Should I get 2 to replace the one in the other speaker as well? Is there an upgrade {aftermarket or Jensen} to this driver that matches the acoustic characteristics of the M1? The markings on the blown driver are D04-0090 and 8H745. Any help is appreciated Tks.