What arb?

[00monkeyboy00]

Hi guys, I'm now to the A3 scene, I've just brought a 1.8t sport which I'm loving! It has a lot of miles on it (219k to be exact) and has been converted to gas.

One of the problems I'm having though is that the arb bushes are worn. I'm trying to work out what size the arb is so I can replace the bushes. Any clue how I can fine out?
also I'm going to do a full service shortly, are there any specific parts worth getting over oem?

cheers guys

 

[epox]

Use a opened spanner and fit over the bar 18,19,20,21 may work.?

Mark

 

[CazzaVR]

Digital calipers or as above.

 

[00monkeyboy00]

Cheers guys. Most appreciated.