I've had a couple of this style of plastic clip crack. Wrapping it in thread and then applying super glue seems to work pretty well. I also tried wrapping with fishing line, but it came undone pretty quickly. Just wanted to share the tip! Now if only I had a fix for when the prongs on the other half break off.
Fun solution, I do have some other failed plastic pieces I might want to upgrade to metal.
Though SCS seems to do flat/folded pieces, not volumetric, from skimming their site.