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I had a pair of Type E/IIIs’ that had the woofers professionally refoamed at Simply Speakers in Clearwater, FL. When I tried to sell them several years later I discovered that most would-be buyers balked when they realized that the woofers were refoamed and not replaced with the original Vifa drivers.
Eventually I sold them locally for only $150.00; in my mind that was practically giving them away. I can say without reservation that the buyer received the best sounding speakers he ever heard for $150.00.
I would recommend that you purchase the original woofers from the company in the link below. It will cost more to replace them but you'll recoup more of your investment when you sell them.