TZ rims have holes in them and that's the way they come. If you want them for aesthetic reasons then you have to accept the holes and paint the bearing cap silver if that is what is concerning you. For my money (and I have what you call the TZ rims on my lightweight and the GTA rims on my Spider) the 14" GTA rim with a 165 tyre is the best visual result.
'57 Spider Veloce, '57 Lightweight, '60 SZ, '76 2000 Spider. '60 Sprint