Klipsch parts come up regularly on eBay also. That's a hit or miss gamble, but there are certainly good deals to be had, and the parts are usually the vintage stuff, which is a good thing. IMO the vintage Klipsch drivers are better made than the newer ones. The newer stuff is built where ever labor is cheap. I got a replacement Klipsch passive woofer for some Forte II's from them. The replacement was made in Mexico and no longer had the nice thick gasket around the outer ring protecting the glue line. In fact the glue on the first one the sent was so sloppy (it looked like a kindergarden project) that I had to return it for a replacement. They no longer could supply the gasket so I had two speakers that did not match and ended up buying a second passive to match. Vintage Klipsch parts were mostly made in the U.S. and seemed to have more attention to detail. I've owned four different pairs of Klipsch speakers, all vintage, and none none had the sloppy construction of that newer passive woofer I received. If you do change one driver in your speaker for a newer one you should probably change the same driver in the other speaker to keep the two in balance. Ask if the designs for the newer replacement drivers are identical to the ones they replace.
Good luck.
Marco
Good luck.
Marco