Normally Wayne's advice would be spot on. However those speakers are already dreadful and always were.
Those speakers are typical of those Far Easter three way speakers of the era. Large woofer, a cheap squawker mid and cone tweeter.
Those speakers were built to play loud and were sensitive. This makes finding a replacement difficult. However Visiton make a
cheap generic replacement for speakers of that ilk. You will need to replace the mids in both speakers, so that both have the same version of awful. You will likely have to modify the cabinet somewhat to install the Visiton drivers.
The speakers are 93 db 1 watt 1 meter in sensitivity. The Visiton is 90 db. However that will probably be about right and take care of the bandpass gain.
It is not worth spending a lot on those speakers, as the pair is worth lees then $100 per pair even on optimal condition.