Oh man, this is a constant worry! I managed to find a decent replacement for my '77 CW's main cluster (which was becoming chalkdust) a handful of years ago, and just recently finally secured a factory rally gauge cluster, which also seems in solid shape. But I feel like it's only a matter of time before old age comes for them too! Seems every now and again someone ruminates on/threatens to 3D print a run of these, but it never actually happens.