I've got a series 5.5 and series 6 Leica filter drawer, for the various big lenses, along with two ND filters in each size on auction at Ebay. Please see the auction here (click 'view seller's other items' to see the rest).

If you'd like to have any of these, please make me an offer, and I'm likely to end the auction just to get them in the hands of someone who'll use them. Thanks for looking.