I have a pair of 522/4 mm boards you can have for Ā£80 posted RMSD. Purchased from Radfords HiFi in Bath in 2001, and had about 6 months use only since then (currently residing in a non-dusty drawer). Not got the original box, but will package well. Only caveat is I'm away until Sunday, so wont be able to post till next monday. dm if interested