If i'm not mistaken these Chrome and stainless steel Repa pillar loops are fitted to some 914 seat belts. I have 15 new old stocks pairs of these for sale. These are nearly impossible to restore.
£30 UK pounds per pair + paypal & shipping.
Dave
20201204_110304 by stretch1985, on Flickr
20201204_110318 by stretch1985, on Flickr