Hello! 

I am interested in buying parts that fit into Petzl's "AlpenAdapt" system (though I know that not everything works with everything else as seamlessly as one may like). I currently have a pair of Darts and the "Kit Cord-Tec". But I might need to have enough gear for 2 people soon, and looking to do mountaineering as well as ice climbing. I have a lead on a "Fil", but would be interested in a "Fil Flex", a "Back Flex", a "Back Lever", or even an "Elastic Strap", if the price is right. Front sections or whole crampons could be of interest as well, and I think I am generally interested in items that have both parts of the pair, as opposed to, say, only a left front section. 

In any case, thank you for your time and happy trails!