they're very hard to find so thieves like to nick them, i bet thats what happened to yours.
i'm not sur eif a fiat dealer woudl be able to supply the mesh seperately, but i would ask. failing that you need to keep your eyes open for someone breaking a punto with abarth bumpers, or find one in a scrapyard. i once found a punto with abarth bumpers at a scrapyard, weeks later it was still there, in hindsight i wish i bought the bumpers and skirts to sell on ebay, they only wanted £100 for the lot.
local motorfactor wil sell a variety of mesh, but it wont be cheap. local garden centre wil also sell a variety of mech, much cheaper. local building supply yard will have all sorts of mesh for a few pence. or you can go to halfords and pay £20 for a tiny slice of mesh.
i bet you do have a local motorfactor, at least 10 of them within 10 miles coz you're in south london. what is your postcode?
oh you live in kent, bloody hell there really is nothing there. try these 4-
Queensway Auto
99 Queensway,
Petts Wood,
Orpington,
Kent
BR5 1DQ
Tel: 01689 821382
Robin Hood Motor Spares
7 Windsor Drive,
Orpington,
Kent
BR6 6EY
Tel: 01689 856807
Tel: 01689 850420
Colrose Car & Cycle
66, High St,
St. Mary Cray,
Orpington,
Kent
BR5 3NH
Tel: 01689 875361
Olley's Accessories
151, Sevenoaks Way,
Orpington,
Kent
BR5 3PW
Tel: 01689 898988
yeah whatever, its kent