FWIW that big oval hole for intenal TT cable routing should have a plastic (or synthetic "rubber") insert grommet that were used by several Italian brands and made by...uh...some Italian company but I forget the name!

I'll update this if I find that info
Edit: possibly these "Cinelli" style plug/grommets might fit and they are also knocked off by other makers and can (sometimes) be found on eBay...I think even when Cinelli was the primary supplier they had counterfeiters in Italy knocking them off!