I did some research.
Here's an idea, get some ABT or Hella dual rounds and modify them. I happened across these pictures:
This is the blue car I thought did the mk2 conversion but he actually cut ABT rounds in half, removed the second light and reattached the curved end to the single light half:

Another guy did the same:

Dual rounds with the inner light removed for cold air feeds, VW racing did this with some mk3s before:

And this is doing it wrong, mk2 quads on a Jetta. This one is apparently genuine:

This guy put in single rounds and no grille but from his build thread I think he said they were rounds from an E30:

Here's another option, Hella single rounds. Pretty damn rare because they were ugly even in the 90s, but here are some shots from a mk3 rally car:


Hope that helps mate
