I sent you an email with a few websites to check out.
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Contact Bill LeGall at Miller Sound.He is expert at modifying,and repairing the "Classic" Infinity stuff.He also has spare drivers,from what I have read.
I used to own the RS-IB's,and have a dear friend who had his crossover,and cabinet modded by some local friends.He has only enough spare parts for himself,but the speaker still amazes me.It's an amazing design,that still embarasses many big dollar products.
You definitely want to check out this LeGall guy!
Best of luck