My A4 Avant 1.9 TDI Quattro only had 288's at the front, and was a massive jump to the 245's I have on now. Most go for the 312mm from others on the B6 platform (comparable models from Skoda, VW and Seat) as above.
As far as I know the Mk4 Golf carriers wont fit as they attach to different hubs.....I dont think any of the dimensions are the same. I did have an upgrade kit for my GT TDI Mk4 but sold it on eBay a few months ago. (Carriers from a Mk1 Audi TT).
I would say that it is they unlikely they are the same. Pretty sure it has been discussed before on here.....