Dreamweevr

I recently traded a pair of Bose 151 indoor/outdoor speakers for these vintage Klipsche. One of the speakers on the backside is busted, what should I replace it with? They sound great even with a busted speaker but want to replace both of the backside ones.....the only legible writing on the tag is KG4 1985 Thank.....

Can someone help me identify these? Any help would be greatly appreciated I traded a pair of Bose indoor/outdoor speakers for these with a friend!! The back speaker is busted on one of them but thats it....the only legible thing on the sticker was KG4 1985..... thanks!!