i may be wrong but believe Roy used the 4 ohm version of that woofer not the 8 ohm listed on that website. I actually have a few spare woofers, have to check but I recall Roy had sent me two extra woofers about 10 years ago. I still have the Callistos so could probably part with one of the woofers. He also would make a mark on the back of the woofer drivers which would indicate how he matched them either a slash mark on a circle mark I believe. You can send me a private message and we can discuss and in the meantime I'll check to try and find the spares I know I have them.
I spoke with Midwest Speaker Repair. They were open to taking a look at the woofer to see if they could repair. Thanks for the pointer Ralph. I will still be on the lookout to buy one if I find one. Otherwise I am stuck with trying to find a woofer with similar characteristics electrically and fits the 5 3/8 baffle cutout