now that i replaced my set of 6.5" components with a new pair. i still have my old ones (polk audio ex3560), but with 1 blown woofer. tweeters/crossovers/1 woofer is fine. are these leftover equipment still valueable you think?

my friend has infinity coaxial speakers with his factory tweeters, would the crossovers from these work with his aftermarket 6.5" speakers and factory tweeters?