Let me offer some Mueter Adapters here before showing them on EBAY, all in good shape: 801, 804, 805, 808, 809, 815.
Price is 10€ per adapter or reasonable offer(s) for more than one or exchange against adapters NOT on this list:
801, 802, 804, 805, 806, 807, 808, 809, 811, 813, 815, 816, 820, 846, 860, 861, 878, 879