picture of 4G ballast:

this is the specification of headlight:

Checking at ETKA it's like this:

- 2B (5G ballast), 2C (5GL ballast), 2 (4G ballast)
- harness from ballast to bulbs is the same for 5G and 5GL (2A - 3D0 971 671 A).
- harness for power input to ballast 5GL (2E - 8E0 971 671), for 2D ETKA doesn't give you any results
- 4G ballast, give's result (repair kit), it can be done with 5GL but headlight has 6pin power plug, original you need D2S Igniter bulb holder. But you can swap to D1S
2B (5G) and 2C (5GL) gives the same part number= part number for 5GL ballast. If i understand correctly the whole thing:
--- If you have 4G ballast, buy repair kit (costs around 500€),
--- if you have 5G ballast, buy 5GL ballast and power input harness 2E - 8E0 971 671.
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