Help identifying avant tail lights

[JoshOfficial]

I've had these rear lights for years, got them from a guy getting rid of old parts who said he found them once on German eBay. I've never seen another pair the same as they're quite different from the well known smoked versions; I prefer these to the smoked versions tbh. The only markings on them is the E1 stamp, anyone have any ideas?

[Ryan80]

They look like aftermarket lights, perhaps FK tuning?

[JoshOfficial]

They look like aftermarket lights, perhaps FK tuning?

Hi, yeah I figured they would be aftermarket by someone but I've never seen a pair the same anywhere on the internet. The FK tuning brings up some variations tbf but still no match that I can find. Thanks!