Replying to Fixing the Rossignol Scratch/dildo/lookP10-14 Bindings...any thoughts?

Hey, so on the heelpiece of this binding, there are two identical plastic caps that fit in the rotating pin part of the binding. so the rotation axis point when you click in is the bar that these are on both ends of, one of them cracked and fell out, and now the heelpiece doesn't have anything holding it together on the one side. I have a pair of look bindings that are similar, but don't want to have to redrill my boards.

so does anybody know how to go about taking the cap of one pair of the bindings and replacing the broken one with it? or am I just gonna need to swap some bindings off some other skis and throw them on?