Hello,
Look here if someone has an idea of which model!
If not, keep looking here until you find it!
It looks like they are from the 70s before the EMIT, maybe early 80s.
Forget about replacing the Drivers! You will never find them. Infinity has so many models and they just don't stock or support things from that far back! First, make sure the drivers are original and if so, have them re-edged (re-foamed). Make sure the crossover is working properly and the binding posts and wiring is all done with quality wire and soldering.
Then if the grills need to be redone, finish them and then listen! Hopefully, they will be worth it!
Regards//Keith