This recent thread on the uk 80-90 forum talks briefly about the problem.

http://forum.club8090.co.uk/viewtopic.php?f=4&t=147315

Inner lights from mark Ii golf seem to be the right size but don't have the required tabs.

Alistair

> On Nov 5, 2015, at 5:13 AM, Nick Feickert <thesuperflydisco@GMAIL.COM> wrote:
> 
> Hello Vanafans!! OK, right now I'm looking to add some kick ass halo
> lighting to my existing SA Grille lights. The 7" rounds are no problem
> since the lens are pretty standard and lots of options for different Halo
> makers. (Big price difference between Octane lighting and Oracle
> lighting). Anyway, The 5 3/4" inner headlights are the problem. And it
> also raised the question of replacing them in general. I have already had
> to order a new inner from GW since my original SA inner light has failed
> and corroded inside the lens. These lens come with special tabs (headlight
> adjustment tabs) welded to the back edge of the lens. No one seems to make
> a lens with these tabs. So when all of you start to experience failures
> with these lens over time, what are we gonna do??? I can only assume that
> either Hella still makes them (or not), and GW and BD, etc. will
> eventually run out of replacements. Are we all screwed at that point!?!?