When I enquired about getting mine done, I asked autoglass if I could have an OEM VW one, if I went ahead, and they said yes, just takes a bit longer to get. You just got to say the chip / crack is bigger than 25 mm. Don't know if they check?? Didn't sound like it...
I didn't bother in the end, for the reasons some have mentioned, plus didn't fancy the way they have to cut the old one out, glue it back in - all sounded like a recipe for a creaky dashboard, but I am a bit OCD about creaks and rattles - ha ha, so I put up with the chip, as it's very low down