Altec Birdcage (639A) microphone dynamic capsule replacement

I have this Altec Birdcage mic that had no sound from the dynamic capsule (ribbon is working great). The thin wires from the capsule had lost connection - trying to repair it they just kept breaking and it is shot. I'm wondering if anyone has ideas on a replacement for the dynamic capsule? It needs to be omni to work (the mic puts the dynamic in combination with the ribbon to get cardiod) And the dimensions are about 34mm diameter with an allowed depth of about 20mm