Hmmm, interesting one that. I reckon you will have an ARB, but it'll be connected somewhere other than the damper body. All GTIs have ARBs I think. The bigger engined ones just have thicker ones...
Anyhoo, your question about when it was built may be a toughy... If I were you I'd call them and tell them, you will probably be best ordering the later one and if it's not right, you can return it...
