1. Donati Gomme S.R.L., Italy 2. Goodyear Italiana Spa., Italy. 3. M.A.L.Z. Di Alessandri F. Zini F. & C. Snc, Italy 4. Michelin Italiana Spa., Italy. 5. Trelleborg Wheel Systems Spa., Italy. 6. Zambelli Srl., Italy.