Regarding aero components, there are now other alternatives from the various BlueMotion vehicles which cover the back end of the underneath of the car. I don't know which of these might fit the A2.
http://www.mk5golfgti.co.uk/forum/index.php/topic,22986.110/
I've tried to extract part numbers from the thread, but beware, I don't know if they match up to the picture or if they'd fit the A2 in any case. Has anybody got an EKTA diagram for the Polo BlueMotion / Golf Bluemotion underbody stuff?
2a &
2b: Rear arm covers from Audi TT
left side: 1K0 511 539 E 5,12 € Stone chip Guard £5.37
right side: 1K0 511 540 C 5,30 € Stone Chip Guard £6.75
8E0 825 267 0,44 € 4 x spreader rivet £0.12 (need 4 so x4)
2 x 1K0 609 734 C brake cable clamp
2 x N 102 854 02 bolt
The following 2 cover the arm the suspension spring is sitting in
Stone guard track control arm 1k0 511 533 D left side
Stone guard track control arm 1k0 511 534 D right side
4 in the picture:
Rear axle cover ("Verkleidung Hinterachse" = "Hinterachsverkleidung") from Golf TDI bluemotion
1k0 501 713 D Trim for Rear Axle £26.73
1K0 501 682 (fixings?) Retaining bracket £1.89
N905 483 05 (fixings?) retaining bolt 47p
N901 838 02 (fixings?) retaining bolt £1.63
Or alternatively the version from the BlueMotion Passat which looks more impressive but is less likely to fit:
Covers rear suspension
3C0 501 713 A Verkleidung fuer Hinterachse
3 in the picture:
"rear muffler deflector" - comes from TDI bluemotion
Maybe one of these is the 'number 3', don't know which one
1K0 825 206 A - Unterbodenverkleidung links hinten
N 909 707 02 - Schnappmutter 2 x
WHT 000 713 - Sechskantbundmutter (2 x ??)
1K0 825 221 - Winkel bracket
N 905 483 03 - Sechskantbundschraube M8
N 901 838 02- Sechskantbundmutter selbstsichernd
N 908 338 01 - Spreizmutter
Possibly
1a &
1b from the picture?? Or they might be bigger stand-alone humps.
'humps' (deflectors) protect axle against stones etc, standard on the BlueMotion
Extra lumps 1K0 825 001 B x1
1K0 825 002 B x1
N 909 591 01 fixing kit x4
N 103 546 02 fixing kit x10