I´d like to know if the black diamond...
I´d like to know if the black diamond glidelite mohair pure sts climbing skins fit the k2 backlash ski 1.74 cm (129-92-115)
They'll fit as long as you don't mind the more traditional BD attachment system instead of the K2 Z Clip attachment that the skis were designed for. You have 37mm difference between your waist and tip, so you could probably go with the 110mm width and still have adequate coverage and a little extra glide up front. If you want full coverage for optimal grip and don't mind the extra trimming and waste, then you could go with the 125mm width.