I used my standard GTI top half so I don't have a cost on that, but I do have this info:
1K6 807 433 C GRU - Lower half of the bumper which requires painting as it comes in primer - £245
1K6 807 568 9B9 - Black trim that clips into the above item and wraps around the exhaust - £123
1K6 807 441 E 9B9 - Toe eye cover to suit R32 bumper - £5
1K6 945 105 A - n/s reflector - £16.50
1K6 945 106 A - o/s reflector - £16.50
Hope this helps you out.