In reply to Flatus Vetus: > NB These are not NN 75mm type boots
Really? they look like standard 75mm duckbills in that link. If so, and you're after something equivalent to the discontinued Rottefella Riva, I think the cheapest and lightest option now is the Voile 3pin/cable binding, available from the Canadian Mt Coop or Telemark Pyrenees.