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WTB Magneplanar Tympani IVa bass panels

Wanted to buy
I have a pair of Tympani IVa's and want to try an experiment.

The Tympani IVa's have two bass panels but one panel is tuned a little higher to improve the mid bass of the system. I have replaced the midrange panels in my system with Bohlender and Graebener RD75's which are capable of operating lower in frequency than the Tympani mid panel. The RD75's are magnificent and don't need the help. I would like to replace the 'tuned up' bass panels with a 'true' base panel to make double bass Tympani IVa's.

I would prefer panels in good working order but as long as it is repairable we can probably work something out. Bass panels out of the frame would be ok too.

Somewhere within a days drive of Dayton, OH would be great but further, or even shipping is not out of the question.

I am looking only for a pair of bass panels, I don't really have any use for complete speakers.

Tympani IVa's only please.