I would say, it depends what it is worth to you.
I wouldn't do it.
The spider usually needs replacing too + the medium and tweeter are also very old... so overall the speakers won't sound great and won't be any near how they sounded originally. Not that they much good new.
The woofers, mediums and tweeters, are quite mediocre. look at those cheap connectors at the back!!
Marantz just made them so they could offer the full spectrum and audio products
Having said this, they do look nice.
just my opinion