What Size Is My Arb

i was thinking of upgrading my arb bushes the car is coming up to 10 years old and i was thinking of fitting poly bush arb bushes to my standard arbs . obviosly rubber deteriates over time , so i was going install polybushes .

problem is i dont know what size my bar is . 2005 a3 v6 3.2. if u do a search it comes up with different sizes.

i dont want to replace the hole arb , just upgrade the rubbers.

thanks ray

i have just measured by front arb and its 22mm and 19.6 rear i used digital callipers. this seems very large, u can buy aftermarket arbs witch are the same size.