Gloss black badges - size for rear ?

[Jono400]

Hi guys due to pick up my new 20 plate A3 saloon next week and fancy picking up a few gloss black badges for it . Looked on eBay and there appears to be two different sizes for the front for sale for the Audi A1 A3 A4 A5 and A6. some are 285mm in size and some are 192mm.

any ideas on what the 20 plate takes . It’s obviously the facelift model but not the latest facelift ie. Year 20 / 70 upwards

any tips for removing the old chrome ones ?

thanks guys .