Several years ago I did this mod. I am away from home with no internet and limited mobile data. I have leaking brake fluid from a corroded brake pipe from the caliper and it is at a garage to replace. I cannot remember if this mod uses replacement carriers only or would I have used different calipers? I do remember buying used Audi TT calipers and carriers but am unable to remember more. The garage have ordered replacement pipes for a standard mk 1 4x4 but I now have a feeling the rear disk mod requires using the whole TT caliper and carrier so will need a TT part.

Can someone confirm? 

Mark

OK panic over I think. Pretty sure I put on s/h calipers and carriers from a TT but did not  use new hoses. I got access to internet and found a German parts company selling Brake hose rear left for Golf IV 4motion, Audi A3 TT quattro, Octavia 4x4 and Leon4  OEM ref.1J0611763L.

Rear right is 1J0611764L

So looks like as the garage ordered parts will fit the TT calipers.

Thank you

Mark