Hi and happy new year and many happy landing to all !!

I have Model 5 with a 912ULS, the engine hast 4 EGT Probes that are screwed in the exhaust by what seems to be nutplates ?!? (I try to attach a picture).

One of them is broken, but I don't know what kind of attachment this is.
Maybe someone has a similar construction and can help me.

0272 IMG_1559.jpg0273 IMG_1560 Kopie.jpg