Klipsch KG2 Speakers- Crossovers Needed- Where to Purchase?

I recently inherited a pair of Klipsch KG2 speakers, both were apparently working some time ago, I have tried to run them with a reliable amp and it appears that one of them is sounding muffled, a friend suggested I replace the crossover.  Does anyone know a reliable source for new/used/refurbished crossovers for these older speakers?  Might there be a new option worth considering for both speakers.  They are in great shape and I understand that these would be great for a smaller room, they are noted as "bookshelf" speakers but I'd need a really big bookshelf, wanting to use them as stand alone.  All info welcome and thanks in advance.