there is one listed under the online shop on vagparts website for the A3!!!
text below from there website.
Sunglass holder
This sunglass holder replaces a grab handle in the headlining and provides a safe, secure place to store your sunglasses when not in use. Soft anti scratch lining and soft touch open/close.
Known to fit MK3 and MK4 Golf, Bora, A3, some Polo's and probably more cars.
Available in pearl grey (pictured) and light beige. Choose below.
Order number: 1J0857465***
Our price: 15.81 GBP
29.90 USD
plus 17.5% VAT
Colour: Pearl grey(Y20) Light beige(8YS)