Gold centers were common in the 80's. Quite a few Mercedes had them.
I painted the centers of a set of Cortina wheels gold, that were on my Daihatsu Charade in 1987, so must have got the idea from somewhere. Get me. Fitting wheels from another manufacture on a car and painting them a lairy colour. All this before wheels whores had been thought of.
Back on topic, I have seen the blue Hella sticker on ebay before now for a few pence. From what I remember, the blue stickers were on aftermarket lights and spot light grille kits. They were never original on factory spot lights, but may have been on dealer fitted grille kits, but should never be seen on a GTI.